Weather for Grimsby, Ontario
Current Weather
Five Day Weather Forecast
Tue
H: -4°C
L: -7°C
Wed
H: -3°C
L: -8°C
Thu
H: -6°C
L: -10°C
Fri
H: -6°C
L: -9°C
Sat
H: -3°C
L: -6°C
Air Quality
Nitrogen Dioxide: 6.55 μg/m3
Sulphur Dioxide: 2.55 μg/m3
Ozone: 75 μg/m3
Astronomical
Sun Transit: 12:20 AM
Sunset: 4:52 PM
Daylight: 9 hrs 2 mins
Moon Transit: 8:56 PM
Moonset: 3:34 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 82.8%
Best Times for Fishing or Hunting
Major Periods
9:24 AM - 11:54 AM8:26 PM - 10:56 PM
Minor Periods
12:41 AM - 2:11 PM3:04 AM - 4:34 AM
Action Rating: 2 out of 5
yellow watch - snow squall - in effect
Service Notice – November 2025: The Environment and Climate Change Canada (ECCC) CAP Service undergoes changes from time to time as the business of alerting evolves. For 2025, changes are expected to include... 1) ECCC's initiative to upgrade the presentation of alerts into Colour-Coded Weather Alerts is tentatively set for deployment November 26, 2025. Data changes will appear in CAP following this deployment, 2) the alert name ‘extreme cold warning’ will change to ‘cold warning’, 3) two Public zone names will change in Saskatchewan, 4) ECCC's initiative to introduce free-form polygons to represent the true threat area of a weather hazard continues, there will be changes coming to CAP and 5) other minor improvements and corrections. For more information on these changes: https://comm.collab.science.gc.ca/mailman3/hyperkitty/list/dd_info@comm.collab.science.gc.ca/ | Notification de service – novembre 2025: Le service du PAC d’Environnement et Changement climatique Canada (ECCC) subit périodiquement des changements à mesure que le système d’alerte évolue. Pour 2025, il y aura des changements incluant... 1) l'initiative d'ECCC visant à améliorer la présentation des alertes sous forme d'alertes météorologiques codées par couleur est provisoirement prévue pour un déploiement le 26 novembre 2025. Des changements aux données apparaîtront dans le PAC suite à ce déploiement, 2) le nom de l’alerte ‘avertissement de froid extrême’ changera pour ‘avertissement de froid’, 3) deux noms de zones publiques seront modifiés en Saskatchewan, 4) l’initiative d’ECCC visant à introduire des polygones libres pour représenter la véritable zone de menace d’un danger météorologique se poursuit. Des changements seront également apportés au PAC et 5) d’autres améliorations et corrections mineures. Pour plus d’informations sur ces changements: https://comm.collab.science.gc.ca/mailman3/hyperkitty/list/dd_info@comm.collab.science.gc.ca/
Effective: Tue December 30, 2025, 9:34 AM
Expires: Tue December 30, 2025, 9:01 PM
Local snow squalls possible today. What: Reduced visibility at times in bursts of heavy snow and blowing snow. When: This afternoon and evening. Additional information: Transient lake effect snow squalls off Lake Huron may impact portions of the region through the day. While snowfall amounts are not expected to be significant, visibilities may be significantly reduced at times under these snow squalls. In addition, northwesterly winds gusting 50 to 70 km/h may result in blowing snow and reduced visibility, particularly in open areas. ### Visibility may be suddenly reduced to near zero at times. Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to ONstorm@ec.gc.ca or post reports on X using #ONStorm. For more information about the alerting program, please visit: https://www.canada.ca/en/services/environment/weather/severeweather/weather-alerts/colour-coded-alerts.
Prepare for the possibility of quickly changing and deteriorating travel conditions.
yellow watch - snow squall - in effect
Service Notice – November 2025: The Environment and Climate Change Canada (ECCC) CAP Service undergoes changes from time to time as the business of alerting evolves. For 2025, changes are expected to include... 1) ECCC's initiative to upgrade the presentation of alerts into Colour-Coded Weather Alerts is tentatively set for deployment November 26, 2025. Data changes will appear in CAP following this deployment, 2) the alert name ‘extreme cold warning’ will change to ‘cold warning’, 3) two Public zone names will change in Saskatchewan, 4) ECCC's initiative to introduce free-form polygons to represent the true threat area of a weather hazard continues, there will be changes coming to CAP and 5) other minor improvements and corrections. For more information on these changes: https://comm.collab.science.gc.ca/mailman3/hyperkitty/list/dd_info@comm.collab.science.gc.ca/ | Notification de service – novembre 2025: Le service du PAC d’Environnement et Changement climatique Canada (ECCC) subit périodiquement des changements à mesure que le système d’alerte évolue. Pour 2025, il y aura des changements incluant... 1) l'initiative d'ECCC visant à améliorer la présentation des alertes sous forme d'alertes météorologiques codées par couleur est provisoirement prévue pour un déploiement le 26 novembre 2025. Des changements aux données apparaîtront dans le PAC suite à ce déploiement, 2) le nom de l’alerte ‘avertissement de froid extrême’ changera pour ‘avertissement de froid’, 3) deux noms de zones publiques seront modifiés en Saskatchewan, 4) l’initiative d’ECCC visant à introduire des polygones libres pour représenter la véritable zone de menace d’un danger météorologique se poursuit. Des changements seront également apportés au PAC et 5) d’autres améliorations et corrections mineures. Pour plus d’informations sur ces changements: https://comm.collab.science.gc.ca/mailman3/hyperkitty/list/dd_info@comm.collab.science.gc.ca/
Effective: Tue December 30, 2025, 9:34 AM
Expires: Tue December 30, 2025, 9:01 PM
Local snow squalls possible today. What: Reduced visibility at times in bursts of heavy snow and blowing snow. When: This afternoon and evening. Additional information: Transient lake effect snow squalls off Lake Huron may impact portions of the region through the day. While snowfall amounts are not expected to be significant, visibilities may be significantly reduced at times under these snow squalls. In addition, northwesterly winds gusting 50 to 70 km/h may result in blowing snow and reduced visibility, particularly in open areas. ### Visibility may be suddenly reduced to near zero at times. Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to ONstorm@ec.gc.ca or post reports on X using #ONStorm. For more information about the alerting program, please visit: https://www.canada.ca/en/services/environment/weather/severeweather/weather-alerts/colour-coded-alerts.
Prepare for the possibility of quickly changing and deteriorating travel conditions.
yellow warning - snow squall - in effect
Service Notice – November 2025: The Environment and Climate Change Canada (ECCC) CAP Service undergoes changes from time to time as the business of alerting evolves. For 2025, changes are expected to include... 1) ECCC's initiative to upgrade the presentation of alerts into Colour-Coded Weather Alerts is tentatively set for deployment November 26, 2025. Data changes will appear in CAP following this deployment, 2) the alert name ‘extreme cold warning’ will change to ‘cold warning’, 3) two Public zone names will change in Saskatchewan, 4) ECCC's initiative to introduce free-form polygons to represent the true threat area of a weather hazard continues, there will be changes coming to CAP and 5) other minor improvements and corrections. For more information on these changes: https://comm.collab.science.gc.ca/mailman3/hyperkitty/list/dd_info@comm.collab.science.gc.ca/ | Notification de service – novembre 2025: Le service du PAC d’Environnement et Changement climatique Canada (ECCC) subit périodiquement des changements à mesure que le système d’alerte évolue. Pour 2025, il y aura des changements incluant... 1) l'initiative d'ECCC visant à améliorer la présentation des alertes sous forme d'alertes météorologiques codées par couleur est provisoirement prévue pour un déploiement le 26 novembre 2025. Des changements aux données apparaîtront dans le PAC suite à ce déploiement, 2) le nom de l’alerte ‘avertissement de froid extrême’ changera pour ‘avertissement de froid’, 3) deux noms de zones publiques seront modifiés en Saskatchewan, 4) l’initiative d’ECCC visant à introduire des polygones libres pour représenter la véritable zone de menace d’un danger météorologique se poursuit. Des changements seront également apportés au PAC et 5) d’autres améliorations et corrections mineures. Pour plus d’informations sur ces changements: https://comm.collab.science.gc.ca/mailman3/hyperkitty/list/dd_info@comm.collab.science.gc.ca/
Effective: Tue December 30, 2025, 9:22 AM
Expires: Tue December 30, 2025, 7:01 PM
Local snow squalls and blowing snow expected. What: Near zero visibility at times in bursts of heavy snow and blowing snow. When: This morning and afternoon. Additional information: Transient lake effect snow squalls off Lake Huron will impact portions of the region through the day. While snowfall amounts are not expected to be significant, visibilities may be significantly reduced at times under these snow squalls. In addition, northwesterly winds gusting 50 to 70 km/h may result in blowing snow and reduced visibility, particularly in open areas. For road conditions and other traveller information from the Ministry of Transportation, visit https://www.ontario.ca/511, https://www.twitter.com/511Ontario, or call 5-1-1. ### Visibility will likely be suddenly reduced to near zero at times. Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to ONstorm@ec.gc.ca or post reports on X using #ONStorm. For more information about the alerting program, please visit: https://www.canada.ca/en/services/environment/weather/severeweather/weather-alerts/colour-coded-alerts.
Prepare for quickly changing and deteriorating travel conditions.
yellow warning - snow squall - in effect
Service Notice – November 2025: The Environment and Climate Change Canada (ECCC) CAP Service undergoes changes from time to time as the business of alerting evolves. For 2025, changes are expected to include... 1) ECCC's initiative to upgrade the presentation of alerts into Colour-Coded Weather Alerts is tentatively set for deployment November 26, 2025. Data changes will appear in CAP following this deployment, 2) the alert name ‘extreme cold warning’ will change to ‘cold warning’, 3) two Public zone names will change in Saskatchewan, 4) ECCC's initiative to introduce free-form polygons to represent the true threat area of a weather hazard continues, there will be changes coming to CAP and 5) other minor improvements and corrections. For more information on these changes: https://comm.collab.science.gc.ca/mailman3/hyperkitty/list/dd_info@comm.collab.science.gc.ca/ | Notification de service – novembre 2025: Le service du PAC d’Environnement et Changement climatique Canada (ECCC) subit périodiquement des changements à mesure que le système d’alerte évolue. Pour 2025, il y aura des changements incluant... 1) l'initiative d'ECCC visant à améliorer la présentation des alertes sous forme d'alertes météorologiques codées par couleur est provisoirement prévue pour un déploiement le 26 novembre 2025. Des changements aux données apparaîtront dans le PAC suite à ce déploiement, 2) le nom de l’alerte ‘avertissement de froid extrême’ changera pour ‘avertissement de froid’, 3) deux noms de zones publiques seront modifiés en Saskatchewan, 4) l’initiative d’ECCC visant à introduire des polygones libres pour représenter la véritable zone de menace d’un danger météorologique se poursuit. Des changements seront également apportés au PAC et 5) d’autres améliorations et corrections mineures. Pour plus d’informations sur ces changements: https://comm.collab.science.gc.ca/mailman3/hyperkitty/list/dd_info@comm.collab.science.gc.ca/
Effective: Tue December 30, 2025, 9:22 AM
Expires: Tue December 30, 2025, 7:01 PM
### Visibility will likely be suddenly reduced to near zero at times. Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to ONstorm@ec.gc.ca or post reports on X using #ONStorm. For more information about the alerting program, please visit: https://www.canada.ca/en/services/environment/weather/severeweather/weather-alerts/colour-coded-alerts.
Prepare for quickly changing and deteriorating travel conditions.
yellow warning - snow squall - in effect
Service Notice – November 2025: The Environment and Climate Change Canada (ECCC) CAP Service undergoes changes from time to time as the business of alerting evolves. For 2025, changes are expected to include... 1) ECCC's initiative to upgrade the presentation of alerts into Colour-Coded Weather Alerts is tentatively set for deployment November 26, 2025. Data changes will appear in CAP following this deployment, 2) the alert name ‘extreme cold warning’ will change to ‘cold warning’, 3) two Public zone names will change in Saskatchewan, 4) ECCC's initiative to introduce free-form polygons to represent the true threat area of a weather hazard continues, there will be changes coming to CAP and 5) other minor improvements and corrections. For more information on these changes: https://comm.collab.science.gc.ca/mailman3/hyperkitty/list/dd_info@comm.collab.science.gc.ca/ | Notification de service – novembre 2025: Le service du PAC d’Environnement et Changement climatique Canada (ECCC) subit périodiquement des changements à mesure que le système d’alerte évolue. Pour 2025, il y aura des changements incluant... 1) l'initiative d'ECCC visant à améliorer la présentation des alertes sous forme d'alertes météorologiques codées par couleur est provisoirement prévue pour un déploiement le 26 novembre 2025. Des changements aux données apparaîtront dans le PAC suite à ce déploiement, 2) le nom de l’alerte ‘avertissement de froid extrême’ changera pour ‘avertissement de froid’, 3) deux noms de zones publiques seront modifiés en Saskatchewan, 4) l’initiative d’ECCC visant à introduire des polygones libres pour représenter la véritable zone de menace d’un danger météorologique se poursuit. Des changements seront également apportés au PAC et 5) d’autres améliorations et corrections mineures. Pour plus d’informations sur ces changements: https://comm.collab.science.gc.ca/mailman3/hyperkitty/list/dd_info@comm.collab.science.gc.ca/
Effective: Tue December 30, 2025, 12:33 PM
Expires: Tue December 30, 2025, 10:12 PM
Local snow squalls and blowing snow expected. What: Near zero visibility at times in bursts of heavy snow and blowing snow. When: This afternoon. Additional information: Transient lake effect snow squalls off Lake Huron will impact portions of the region through the day. While snowfall amounts are not expected to be significant, visibilities may be significantly reduced at times under these snow squalls. In addition, northwesterly winds gusting 50 to 70 km/h may result in blowing snow and reduced visibility, particularly in open areas. For road conditions and other traveller information from the Ministry of Transportation, visit https://www.ontario.ca/511, https://www.twitter.com/511Ontario, or call 5-1-1. ### Visibility will likely be suddenly reduced to near zero at times. Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to ONstorm@ec.gc.ca or post reports on X using #ONStorm. For more information about the alerting program, please visit: https://www.canada.ca/en/services/environment/weather/severeweather/weather-alerts/colour-coded-alerts.
Prepare for quickly changing and deteriorating travel conditions.
yellow warning - snow squall - in effect
Service Notice – November 2025: The Environment and Climate Change Canada (ECCC) CAP Service undergoes changes from time to time as the business of alerting evolves. For 2025, changes are expected to include... 1) ECCC's initiative to upgrade the presentation of alerts into Colour-Coded Weather Alerts is tentatively set for deployment November 26, 2025. Data changes will appear in CAP following this deployment, 2) the alert name ‘extreme cold warning’ will change to ‘cold warning’, 3) two Public zone names will change in Saskatchewan, 4) ECCC's initiative to introduce free-form polygons to represent the true threat area of a weather hazard continues, there will be changes coming to CAP and 5) other minor improvements and corrections. For more information on these changes: https://comm.collab.science.gc.ca/mailman3/hyperkitty/list/dd_info@comm.collab.science.gc.ca/ | Notification de service – novembre 2025: Le service du PAC d’Environnement et Changement climatique Canada (ECCC) subit périodiquement des changements à mesure que le système d’alerte évolue. Pour 2025, il y aura des changements incluant... 1) l'initiative d'ECCC visant à améliorer la présentation des alertes sous forme d'alertes météorologiques codées par couleur est provisoirement prévue pour un déploiement le 26 novembre 2025. Des changements aux données apparaîtront dans le PAC suite à ce déploiement, 2) le nom de l’alerte ‘avertissement de froid extrême’ changera pour ‘avertissement de froid’, 3) deux noms de zones publiques seront modifiés en Saskatchewan, 4) l’initiative d’ECCC visant à introduire des polygones libres pour représenter la véritable zone de menace d’un danger météorologique se poursuit. Des changements seront également apportés au PAC et 5) d’autres améliorations et corrections mineures. Pour plus d’informations sur ces changements: https://comm.collab.science.gc.ca/mailman3/hyperkitty/list/dd_info@comm.collab.science.gc.ca/
Effective: Tue December 30, 2025, 12:33 PM
Expires: Tue December 30, 2025, 10:12 PM
Local snow squalls and blowing snow expected. What: Near zero visibility at times in bursts of heavy snow and blowing snow. When: This afternoon. Additional information: Transient lake effect snow squalls off Lake Huron will impact portions of the region through the day. While snowfall amounts are not expected to be significant, visibilities may be significantly reduced at times under these snow squalls. In addition, northwesterly winds gusting 50 to 70 km/h may result in blowing snow and reduced visibility, particularly in open areas. For road conditions and other traveller information from the Ministry of Transportation, visit https://www.ontario.ca/511, https://www.twitter.com/511Ontario, or call 5-1-1. ### Visibility will likely be suddenly reduced to near zero at times. Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to ONstorm@ec.gc.ca or post reports on X using #ONStorm. For more information about the alerting program, please visit: https://www.canada.ca/en/services/environment/weather/severeweather/weather-alerts/colour-coded-alerts.
Prepare for quickly changing and deteriorating travel conditions.
yellow warning - snow squall - in effect
Service Notice – November 2025: The Environment and Climate Change Canada (ECCC) CAP Service undergoes changes from time to time as the business of alerting evolves. For 2025, changes are expected to include... 1) ECCC's initiative to upgrade the presentation of alerts into Colour-Coded Weather Alerts is tentatively set for deployment November 26, 2025. Data changes will appear in CAP following this deployment, 2) the alert name ‘extreme cold warning’ will change to ‘cold warning’, 3) two Public zone names will change in Saskatchewan, 4) ECCC's initiative to introduce free-form polygons to represent the true threat area of a weather hazard continues, there will be changes coming to CAP and 5) other minor improvements and corrections. For more information on these changes: https://comm.collab.science.gc.ca/mailman3/hyperkitty/list/dd_info@comm.collab.science.gc.ca/ | Notification de service – novembre 2025: Le service du PAC d’Environnement et Changement climatique Canada (ECCC) subit périodiquement des changements à mesure que le système d’alerte évolue. Pour 2025, il y aura des changements incluant... 1) l'initiative d'ECCC visant à améliorer la présentation des alertes sous forme d'alertes météorologiques codées par couleur est provisoirement prévue pour un déploiement le 26 novembre 2025. Des changements aux données apparaîtront dans le PAC suite à ce déploiement, 2) le nom de l’alerte ‘avertissement de froid extrême’ changera pour ‘avertissement de froid’, 3) deux noms de zones publiques seront modifiés en Saskatchewan, 4) l’initiative d’ECCC visant à introduire des polygones libres pour représenter la véritable zone de menace d’un danger météorologique se poursuit. Des changements seront également apportés au PAC et 5) d’autres améliorations et corrections mineures. Pour plus d’informations sur ces changements: https://comm.collab.science.gc.ca/mailman3/hyperkitty/list/dd_info@comm.collab.science.gc.ca/
Effective: Tue December 30, 2025, 12:33 PM
Expires: Tue December 30, 2025, 10:12 PM
### Visibility will likely be suddenly reduced to near zero at times. Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to ONstorm@ec.gc.ca or post reports on X using #ONStorm. For more information about the alerting program, please visit: https://www.canada.ca/en/services/environment/weather/severeweather/weather-alerts/colour-coded-alerts.
Prepare for quickly changing and deteriorating travel conditions.
Winter Weather Advisory issued December 30 at 1:16PM EST until January 1 at 1:00AM EST by NWS Buffalo NY
Effective: Tue December 30, 2025, 1:16 PM
Expires: Wed December 31, 2025, 2:15 AM
* WHAT...Lake effect snow through tonight. Snow accumulations 3 to 5 inches in the most persistent lake snows today with additional 2 to 4 inches expected Wednesday afternoon and evening. Winds gusting as high as 45 mph. * WHERE...Niagara, Orleans, Monroe, and Genesee Counties. * WHEN...Until 1 AM EST Thursday. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous.
During lake effect snow, the weather can vary from bands of locally heavy snow with greatly reduced visibilities to dry conditions just a few miles away. Be prepared for rapid changes in weather, visibility, and road conditions.
yellow warning - snow squall - in effect
Service Notice – November 2025: The Environment and Climate Change Canada (ECCC) CAP Service undergoes changes from time to time as the business of alerting evolves. For 2025, changes are expected to include... 1) ECCC's initiative to upgrade the presentation of alerts into Colour-Coded Weather Alerts is tentatively set for deployment November 26, 2025. Data changes will appear in CAP following this deployment, 2) the alert name ‘extreme cold warning’ will change to ‘cold warning’, 3) two Public zone names will change in Saskatchewan, 4) ECCC's initiative to introduce free-form polygons to represent the true threat area of a weather hazard continues, there will be changes coming to CAP and 5) other minor improvements and corrections. For more information on these changes: https://comm.collab.science.gc.ca/mailman3/hyperkitty/list/dd_info@comm.collab.science.gc.ca/ | Notification de service – novembre 2025: Le service du PAC d’Environnement et Changement climatique Canada (ECCC) subit périodiquement des changements à mesure que le système d’alerte évolue. Pour 2025, il y aura des changements incluant... 1) l'initiative d'ECCC visant à améliorer la présentation des alertes sous forme d'alertes météorologiques codées par couleur est provisoirement prévue pour un déploiement le 26 novembre 2025. Des changements aux données apparaîtront dans le PAC suite à ce déploiement, 2) le nom de l’alerte ‘avertissement de froid extrême’ changera pour ‘avertissement de froid’, 3) deux noms de zones publiques seront modifiés en Saskatchewan, 4) l’initiative d’ECCC visant à introduire des polygones libres pour représenter la véritable zone de menace d’un danger météorologique se poursuit. Des changements seront également apportés au PAC et 5) d’autres améliorations et corrections mineures. Pour plus d’informations sur ces changements: https://comm.collab.science.gc.ca/mailman3/hyperkitty/list/dd_info@comm.collab.science.gc.ca/
Effective: Tue December 30, 2025, 5:24 AM
Expires: Tue December 30, 2025, 2:02 PM
Snow squalls and blowing snow continue. What: Near zero visibility in snow and blowing snow. Additional local snowfall amounts of 5 to 10 cm. When: This morning. Additional information: Lake effect snow off Lake Huron continues. Widespread blowing snow resulting in near zero visibility remains the primary concern as northwesterly wind gusts of 50 to 70 km/h are expected. Lake effect snow may affect the area again tonight into Wednesday. For road conditions and other traveller information from the Ministry of Transportation, visit https://www.ontario.ca/511, https://www.twitter.com/511Ontario, or call 5-1-1. ### Travel may be extremely hazardous. Road closures are possible. Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to ONstorm@ec.gc.ca or post reports on X using #ONStorm. For more information about the alerting program, please visit: https://www.canada.ca/en/services/environment/weather/severeweather/weather-alerts/colour-coded-alerts.
Prepare for quickly changing and deteriorating travel conditions.
yellow advisory - blowing snow - in effect
Service Notice – November 2025: The Environment and Climate Change Canada (ECCC) CAP Service undergoes changes from time to time as the business of alerting evolves. For 2025, changes are expected to include... 1) ECCC's initiative to upgrade the presentation of alerts into Colour-Coded Weather Alerts is tentatively set for deployment November 26, 2025. Data changes will appear in CAP following this deployment, 2) the alert name ‘extreme cold warning’ will change to ‘cold warning’, 3) two Public zone names will change in Saskatchewan, 4) ECCC's initiative to introduce free-form polygons to represent the true threat area of a weather hazard continues, there will be changes coming to CAP and 5) other minor improvements and corrections. For more information on these changes: https://comm.collab.science.gc.ca/mailman3/hyperkitty/list/dd_info@comm.collab.science.gc.ca/ | Notification de service – novembre 2025: Le service du PAC d’Environnement et Changement climatique Canada (ECCC) subit périodiquement des changements à mesure que le système d’alerte évolue. Pour 2025, il y aura des changements incluant... 1) l'initiative d'ECCC visant à améliorer la présentation des alertes sous forme d'alertes météorologiques codées par couleur est provisoirement prévue pour un déploiement le 26 novembre 2025. Des changements aux données apparaîtront dans le PAC suite à ce déploiement, 2) le nom de l’alerte ‘avertissement de froid extrême’ changera pour ‘avertissement de froid’, 3) deux noms de zones publiques seront modifiés en Saskatchewan, 4) l’initiative d’ECCC visant à introduire des polygones libres pour représenter la véritable zone de menace d’un danger météorologique se poursuit. Des changements seront également apportés au PAC et 5) d’autres améliorations et corrections mineures. Pour plus d’informations sur ces changements: https://comm.collab.science.gc.ca/mailman3/hyperkitty/list/dd_info@comm.collab.science.gc.ca/
Effective: Tue December 30, 2025, 2:20 PM
Expires: Tue December 30, 2025, 7:59 PM
Poor visibility in snow and blowing snow is expected in some locations. What: Significantly reduced visibility in blowing snow. When: Continuing through this afternoon. Additional information: Northwesterly winds gusting 50 to 70 km/h will result in blowing snow and significantly reduced visibility, particularly in open areas. While lake effect snow off Lake Huron will impact the area at times, snowfall amounts are not expected to be significant. Winds are expected to ease this evening. Prepare for quickly changing and deteriorating travel conditions. For road conditions and other traveller information from the Ministry of Transportation, visit https://www.ontario.ca/511, https://www.twitter.com/511Ontario, or call 5-1-1. ### Road closures are possible. Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to ONstorm@ec.gc.ca or post reports on X using #ONStorm. For more information about the alerting program, please visit: https://www.canada.ca/en/services/environment/weather/severeweather/weather-alerts/colour-coded-alerts.
yellow advisory - blowing snow - in effect
Service Notice – November 2025: The Environment and Climate Change Canada (ECCC) CAP Service undergoes changes from time to time as the business of alerting evolves. For 2025, changes are expected to include... 1) ECCC's initiative to upgrade the presentation of alerts into Colour-Coded Weather Alerts is tentatively set for deployment November 26, 2025. Data changes will appear in CAP following this deployment, 2) the alert name ‘extreme cold warning’ will change to ‘cold warning’, 3) two Public zone names will change in Saskatchewan, 4) ECCC's initiative to introduce free-form polygons to represent the true threat area of a weather hazard continues, there will be changes coming to CAP and 5) other minor improvements and corrections. For more information on these changes: https://comm.collab.science.gc.ca/mailman3/hyperkitty/list/dd_info@comm.collab.science.gc.ca/ | Notification de service – novembre 2025: Le service du PAC d’Environnement et Changement climatique Canada (ECCC) subit périodiquement des changements à mesure que le système d’alerte évolue. Pour 2025, il y aura des changements incluant... 1) l'initiative d'ECCC visant à améliorer la présentation des alertes sous forme d'alertes météorologiques codées par couleur est provisoirement prévue pour un déploiement le 26 novembre 2025. Des changements aux données apparaîtront dans le PAC suite à ce déploiement, 2) le nom de l’alerte ‘avertissement de froid extrême’ changera pour ‘avertissement de froid’, 3) deux noms de zones publiques seront modifiés en Saskatchewan, 4) l’initiative d’ECCC visant à introduire des polygones libres pour représenter la véritable zone de menace d’un danger météorologique se poursuit. Des changements seront également apportés au PAC et 5) d’autres améliorations et corrections mineures. Pour plus d’informations sur ces changements: https://comm.collab.science.gc.ca/mailman3/hyperkitty/list/dd_info@comm.collab.science.gc.ca/
Effective: Tue December 30, 2025, 2:20 PM
Expires: Tue December 30, 2025, 7:59 PM
Poor visibility in snow and blowing snow is expected in some locations. ### Road closures are possible. Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to ONstorm@ec.gc.ca or post reports on X using #ONStorm. For more information about the alerting program, please visit: https://www.canada.ca/en/services/environment/weather/severeweather/weather-alerts/colour-coded-alerts.
Weather Forecast
Average Temperature: -5.7°C
Average Humidity: 77%
Wind: 28 mph
UV Index: 0.2
Air Quality
Nitrogen Dioxide: 3.41 μg/m3
Sulphur Dioxide: 1.93 μg/m3
Ozone: 78.24 μg/m3
Astronomical
Sun Transit: 12:20 AM
Sunset: 4:52 PM
Daylight: 9 hrs 2 mins
Moon Transit: 8:56 PM
Moonset: 3:34 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 82.8%
Best Times for Fishing or Hunting
Major Periods
9:24 AM - 11:54 AM8:26 PM - 10:56 PM
Minor Periods
12:41 AM - 2:11 PM3:04 AM - 4:34 AM
Action Rating: 2 out of 5
Weather Forecast
Average Temperature: -4.9°C
Average Humidity: 78%
Wind: 23.7 mph
UV Index: 0.2
Air Quality
Nitrogen Dioxide: 5.97 μg/m3
Sulphur Dioxide: 2.72 μg/m3
Ozone: 75.6 μg/m3
Astronomical
Sun Transit: 12:21 AM
Sunset: 4:53 PM
Daylight: 9 hrs 3 mins
Moon Transit: 9:58 PM
Moonset: 4:57 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 90.5%
Best Times for Fishing or Hunting
Major Periods
10:24 AM - 12:54 AM9:28 PM - 11:58 PM
Minor Periods
1:21 PM - 2:51 PM4:27 AM - 5:57 AM
Action Rating: 2 out of 5
Weather Forecast
Average Temperature: -7.9°C
Average Humidity: 65%
Wind: 22.8 mph
UV Index: 0
Air Quality
Nitrogen Dioxide: 7.25 μg/m3
Sulphur Dioxide: 3.14 μg/m3
Ozone: 73 μg/m3
Astronomical
Sun Transit: 12:21 AM
Sunset: 4:54 PM
Daylight: 9 hrs 3 mins
Moon Transit: 11:05 PM
Moonset: 6:17 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 96.0%
Best Times for Fishing or Hunting
Major Periods
11:30 AM - 2:00 PM12:00 AM - 12:00 AM
Minor Periods
2:14 PM - 3:44 PM5:47 AM - 7:17 AM
Action Rating: 2 out of 5
Weather Forecast
Average Temperature: -7.2°C
Average Humidity: 70%
Wind: 20.6 mph
UV Index: 2
Air Quality
Nitrogen Dioxide: 8.27 μg/m3
Sulphur Dioxide: 3.21 μg/m3
Ozone: 69.72 μg/m3
Astronomical
Sun Transit: 12:22 AM
Sunset: 4:54 PM
Daylight: 9 hrs 4 mins
Moon Transit: 12:00 AM
Moonset: 7:28 AM
Moon Phase: Full
Moon Illumination: 99.2%
Best Times for Fishing or Hunting
Major Periods
12:00 AM - 12:00 AM12:36 AM - 3:06 PM
Minor Periods
3:21 PM - 4:51 PM6:58 AM - 8:28 AM
Action Rating: 4 out of 5
Weather Forecast
Average Temperature: -4.5°C
Average Humidity: 77%
Wind: 16.1 mph
UV Index: 2
Air Quality
Nitrogen Dioxide: 10.7 μg/m3
Sulphur Dioxide: 3.28 μg/m3
Ozone: 63.69 μg/m3
Astronomical
Sun Transit: 12:22 AM
Sunset: 4:55 PM
Daylight: 9 hrs 5 mins
Moon Transit: 12:11 AM
Moonset: 8:25 AM
Moon Phase: Full
Moon Illumination: 99.9%
Best Times for Fishing or Hunting
Major Periods
12:00 AM - 12:00 AM1:41 PM - 4:11 PM
Minor Periods
4:38 PM - 6:08 PM7:55 AM - 9:25 AM
Action Rating: 5 out of 5