Water Temperature of Lake Ontario in Grimsby, Ontario
Current Water Temperature
Measurement Time: Friday, December 5, 2025, 1:00 PM EST
Temperature Locations
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Local Points of Interest
Hamilton, ON; Toronto, ONStation Name: West Lake Ontario - Grimsby
Station Type: Buoy
Data Source: National Data Buoy Center
Elevation Above Sea Level: 73 meters
Nearest Address:
Grimsby, ON
Niagara Regional District County
GPS Coordinates: 43.25, -79.53
Nearby Water Temperatures
Eighteenmile Creek, Burt, NY (66.3 km)Buffalo River, Buffalo, NY (66.4 km)
Erie Canal, Lockport, NY (68.7 km)
Oak Orchard Creek, Medina, NY (93.1 km)
Oak Orchard Creek, Kenyonville, NY (98.9 km)
Cattaraugus Creek, Gowanda, NY (100.0 km)
Johnson Creek, Kuckville, NY (103.1 km)
Oak Orchard Creek, Kent, NY (108.8 km)
Sandy Creek, North Hamlin, NY (131.1 km)
Allegheny River, Salamanca, NY (138.7 km)
Walnut Creek, Erie, PA (142.9 km)
Northrup Creek, North Greece, NY (144.8 km)
Erie Canal, Rochester, NY (153.0 km)
Genesee River, Rochester, NY (155.6 km)
Allen Creek, Brighton, NY (162.9 km)
Weather for Grimsby, Ontario
Current Weather

Five Day Weather Forecast

Tue
H: -9°C
L: -16°C

Wed
H: -10°C
L: -18°C

Thu
H: -11°C
L: -15°C

Fri
H: -12°C
L: -18°C

Sat
H: -10°C
L: -17°C
Air Quality
Nitrogen Dioxide: 6.85 μg/m3
Sulphur Dioxide: 2.25 μg/m3
Ozone: 66 μg/m3
Astronomical
Sun Transit: 12:30 AM
Sunset: 5:23 PM
Daylight: 9 hrs 45 mins
Moon Transit: 7:45 PM
Moonset: 2:39 AM
Moon Phase: First Quarter
Moon Illumination: 68.0%
Best Times for Fishing or Hunting
Major Periods
8:12 AM - 10:42 AM7:15 PM - 9:45 PM
Minor Periods
11:15 AM - 12:45 AM2:09 AM - 3:39 AM
Action Rating: 2 out of 5
yellow warning - cold - 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 January 27, 2026, 12:18 AM
Expires: Tue January 27, 2026, 2:06 PM
A period of very cold wind chills is expected. What: Wind chill values of minus 25 to minus 30. Brisk winds gusting up to 50 km/h. When: Continuing through this morning. Additional information: Wind chill values will moderate through the day, but are still expected to be minus 15 to minus 20. ### Extreme cold puts everyone at risk. Risks are greater for young children, older adults, people with chronic illnesses, people working or exercising outdoors, and those without proper shelter. Watch for cold related symptoms: shortness of breath, chest pain, muscle pain and weakness, numbness and colour change in fingers and toes. 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.
Cover up. Frostbite can develop within minutes on exposed skin, especially with wind chill. Keep emergency supplies in your vehicle such as extra blankets and jumper cables. Outdoor workers should take regularly scheduled breaks to warm up.
yellow warning - cold - 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 January 27, 2026, 4:55 AM
Expires: Tue January 27, 2026, 2:02 PM
A period of very cold wind chills is expected. What: Wind chill values of minus 25 to minus 30. Brisk winds gusting up to 50 km/h. When: This morning. Additional information: Wind chill values will moderate through the day, although are expected to remain near minus 20. ### Extreme cold puts everyone at risk. Risks are greater for young children, older adults, people with chronic illnesses, people working or exercising outdoors, and those without proper shelter. Watch for cold related symptoms: shortness of breath, chest pain, muscle pain and weakness, numbness and colour change in fingers and toes. 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.
Cover up. Frostbite can develop within minutes on exposed skin, especially with wind chill. Keep emergency supplies in your vehicle such as extra blankets and jumper cables. Outdoor workers should take regularly scheduled breaks to warm up.
yellow warning - cold - ended
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 January 27, 2026, 12:59 PM
Expires: Tue January 27, 2026, 1:59 PM
Extreme cold conditions are no longer expected. ###
yellow warning - cold - 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 January 27, 2026, 12:01 PM
Expires: Tue January 27, 2026, 2:59 PM
A period of very cold wind chills is expected. What: Wind chill values of minus 25 to minus 30. Brisk winds gusting up to 50 km/h. When: This morning. Additional information: Wind chill values will moderate through the day, although are expected to remain near minus 20. ### Extreme cold puts everyone at risk. Risks are greater for young children, older adults, people with chronic illnesses, people working or exercising outdoors, and those without proper shelter. Watch for cold related symptoms: shortness of breath, chest pain, muscle pain and weakness, numbness and colour change in fingers and toes. 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.
Cover up. Frostbite can develop within minutes on exposed skin, especially with wind chill. Keep emergency supplies in your vehicle such as extra blankets and jumper cables. Outdoor workers should take regularly scheduled breaks to warm up.
yellow warning - cold - 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 January 27, 2026, 12:01 PM
Expires: Tue January 27, 2026, 2:59 PM
A period of very cold wind chills is expected. ### Extreme cold puts everyone at risk. Risks are greater for young children, older adults, people with chronic illnesses, people working or exercising outdoors, and those without proper shelter. Watch for cold related symptoms: shortness of breath, chest pain, muscle pain and weakness, numbness and colour change in fingers and toes. 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.
Cover up. Frostbite can develop within minutes on exposed skin, especially with wind chill. Keep emergency supplies in your vehicle such as extra blankets and jumper cables. Outdoor workers should take regularly scheduled breaks to warm up.
Weather Forecast
Air Quality
Nitrogen Dioxide: 8.17 μg/m3
Sulphur Dioxide: 2.63 μg/m3
Ozone: 68.16 μg/m3
Astronomical
Sun Transit: 12:30 AM
Sunset: 5:23 PM
Daylight: 9 hrs 45 mins
Moon Transit: 7:45 PM
Moonset: 2:39 AM
Moon Phase: First Quarter
Moon Illumination: 68.0%
Best Times for Fishing or Hunting
Major Periods
8:12 AM - 10:42 AM7:15 PM - 9:45 PM
Minor Periods
11:15 AM - 12:45 AM2:09 AM - 3:39 AM
Action Rating: 2 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 7.75 μg/m3
Sulphur Dioxide: 2.53 μg/m3
Ozone: 66.88 μg/m3
Astronomical
Sun Transit: 12:31 AM
Sunset: 5:25 PM
Daylight: 9 hrs 47 mins
Moon Transit: 8:47 PM
Moonset: 3:57 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 78.1%
Best Times for Fishing or Hunting
Major Periods
9:13 AM - 11:43 AM8:17 PM - 10:47 PM
Minor Periods
12:01 AM - 1:31 PM3:27 AM - 4:57 AM
Action Rating: 2 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 10.6 μg/m3
Sulphur Dioxide: 3.37 μg/m3
Ozone: 62.96 μg/m3
Astronomical
Sun Transit: 12:31 AM
Sunset: 5:26 PM
Daylight: 9 hrs 50 mins
Moon Transit: 9:52 PM
Moonset: 5:10 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 86.7%
Best Times for Fishing or Hunting
Major Periods
10:17 AM - 12:47 AM9:22 PM - 11:52 PM
Minor Periods
12:59 AM - 2:29 PM4:40 AM - 6:10 AM
Action Rating: 2 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 10.9 μg/m3
Sulphur Dioxide: 3.42 μg/m3
Ozone: 60.16 μg/m3
Astronomical
Sun Transit: 12:31 AM
Sunset: 5:27 PM
Daylight: 9 hrs 52 mins
Moon Transit: 10:56 PM
Moonset: 6:12 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 93.4%
Best Times for Fishing or Hunting
Major Periods
11:22 AM - 1:52 PM12:00 AM - 12:00 AM
Minor Periods
2:11 PM - 3:41 PM5:42 AM - 7:12 AM
Action Rating: 3 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 11.68 μg/m3
Sulphur Dioxide: 3.53 μg/m3
Ozone: 61.08 μg/m3
Astronomical
Sun Transit: 12:31 AM
Sunset: 5:29 PM
Daylight: 9 hrs 54 mins
Moon Transit: 11:56 PM
Moonset: 7:00 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 97.9%
Best Times for Fishing or Hunting
Major Periods
12:23 AM - 2:53 PM12:00 AM - 12:00 AM
Minor Periods
3:30 PM - 5:00 PM6:30 AM - 8:00 AM
Action Rating: 4 out of 5
