Water Temperature of Lake Ontario in Grimsby, Ontario

Current Water Temperature

-0.9°C

Measurement Time: Friday, December 5, 2025, 1:00 PM EST

Temperature Locations

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Local Points of Interest

Hamilton, ON; Toronto, ON

Lake Ontario

Station 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

4.6°C
Cloudy
Cloudy
4.3°C
6.1°C
86%
SSE 3.6 kph
10.8 kph
4.6°C
4.3°C
0 mm
0%
10 km
1019 mbar
0.8

Five Day Weather Forecast

Overcast
Tue
H: 6°C
L: 3°C
Moderate or heavy snow showers
Wed
H: 1°C
L: -1°C
Overcast
Thu
H: 0°C
L: -2°C
Heavy rain
Fri
H: 5°C
L: 0°C
Light snow
Sat
H: 1°C
L: -2°C

Air Quality

AQI: 1 - Good
PM2.5: 32.85 μg/m3
PM10: 32.95 μg/m3
Carbon Monoxide: 348.85 μg/m3
Nitrogen Dioxide: 39.75 μg/m3
Sulphur Dioxide: 17.15 μg/m3
Ozone: 11 μg/m3

Astronomical

Sunrise: 7:13 AM
Sun Transit: 12:32 AM
Sunset: 5:52 PM
Daylight: 10 hrs 39 mins
Moonrise: 7:23 AM
Moon Transit: 12:44 AM
Moonset: 6:15 PM
Moon Phase: New
Moon Illumination: 0.0%

Best Times for Fishing or Hunting

Major Periods

1:17 AM - 3:47 AM
12:14 AM - 2:44 PM

Minor Periods

5:45 PM - 7:15 PM
6:53 AM - 8:23 AM

Action Rating: 5 out of 5

special weather statement 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: Mon February 16, 2026, 11:06 PM
Expires: Tue February 17, 2026, 3:06 PM

Hazardous winter conditions expected Wednesday. What: Several hours of freezing rain with ice build-up of 5 to 10 mm possible. Icy and slippery conditions. Snowfall amounts near 5 cm Reduced visibility in snow. When: Beginning Wednesday morning and continuing through Wednesday evening. Additional information: A low pressure system is expected to bring snow and freezing rain to the region on Wednesday. There remains some uncertainty with the track of this system as such, snowfall amounts and areas affected could change. Roads and walkways may become icy and slippery. Visibility may be suddenly reduced at times in snow. Some travel delays are possible. Local utility outages are possible. Warnings may be issued as the event draws closer. ### 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.


special weather statement 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 February 17, 2026, 5:55 AM
Expires: Tue February 17, 2026, 9:55 PM

Hazardous winter conditions expected Wednesday. What: Several hours of freezing rain or ice pellets. Ice build-up of several millimetres is possible. Icy and slippery conditions. Snowfall amounts near 5 cm Reduced visibility in snow. When: Beginning Wednesday morning and continuing through Wednesday evening. Additional information: A low pressure system is expected to bring snow, ice pellets and freezing rain to the region on Wednesday. At this point, confidence is lower than normal regarding snowfall and freezing rain amounts. It is possible that precipitation may mix with ice pellets for several hours. If this happens, snowfall and freezing rain amounts would be less. Roads and walkways may become icy and slippery. Visibility may be suddenly reduced at times in snow. Some travel delays are possible. Local utility outages are possible. Warnings may be issued as the event draws closer. ### 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.


special weather statement 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: Mon February 16, 2026, 6:45 PM
Expires: Tue February 17, 2026, 10:45 AM

Significant rainfall and freezing rain possible on Wednesday. What: Rainfall with amounts of 10 to 25 mm. Several hours of freezing rain with ice build-up of 2 to 5 mm for some areas. Icy and slippery conditions. When: Beginning early Wednesday morning and continuing through Wednesday evening. Additional information: A low pressure system is expected to bring rain and freezing rain to the region on Wednesday. There remains some uncertainty with the track of this system as such, rainfall amounts and areas affected could change. Warnings may be issued as the event draws closer. Roads and walkways may become icy and slippery. Some travel delays are possible. Local utility outages are possible. Possible flash flooding and water pooling on roadways. For information concerning flooding, please consult your local Conservation Authority or Ontario Ministry of Natural Resources office. Visit Ontario.ca/floods for the latest details. ### 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 - fog - 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 February 17, 2026, 2:38 AM
Expires: Tue February 17, 2026, 11:00 AM

Near zero visibility in fog is expected over some areas. Visibility is expected to improve later this morning. ### Visibility will likely be suddenly reduced 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.

If driving, turn on your lights, slow down and maintain a safe following distance.


special weather statement 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: Mon February 16, 2026, 11:11 PM
Expires: Tue February 17, 2026, 3:11 PM

Significant rainfall and freezing rain possible on Wednesday. What: Rainfall with amounts of 10 to 25 mm. Several hours of freezing rain with ice build-up of 2 to 5 mm for some areas. Icy and slippery conditions. When: Beginning early Wednesday morning and continuing through Wednesday evening. Additional information: A low pressure system is expected to bring rain and freezing rain to the region on Wednesday. There remains some uncertainty with the track of this system as such, rainfall amounts and areas affected could change. Warnings may be issued as the event draws closer. Roads and walkways may become icy and slippery. Some travel delays are possible. Local utility outages are possible. Possible flash flooding and water pooling on roadways. For information concerning flooding, please consult your local Conservation Authority or Ontario Ministry of Natural Resources office. Visit Ontario.ca/floods for the latest details. ### 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.


Tuesday, February 17, 2026

Weather Forecast

Overcast
6.4°C
2.7°C
4.6°C
93%
0.01 mm
0%
0%
28.1 kph
0.4


Air Quality

AQI: 2 - Moderate
PM2.5: 23.41 μg/m3
PM10: 23.66 μg/m3
Carbon Monoxide: 304.53 μg/m3
Nitrogen Dioxide: 24.06 μg/m3
Sulphur Dioxide: 7.35 μg/m3
Ozone: 38.92 μg/m3

Astronomical

Sunrise: 7:13 AM
Sun Transit: 12:32 AM
Sunset: 5:52 PM
Daylight: 10 hrs 39 mins
Moonrise: 7:23 AM
Moon Transit: 12:44 AM
Moonset: 6:15 PM
Moon Phase: New
Moon Illumination: 0.0%

Best Times for Fishing or Hunting

Major Periods

1:17 AM - 3:47 AM
12:14 AM - 2:44 PM

Minor Periods

5:45 PM - 7:15 PM
6:53 AM - 8:23 AM

Action Rating: 5 out of 5

Wednesday, February 18, 2026

Weather Forecast

Moderate or heavy snow showers
0.5°C
-1.1°C
0.1°C
97%
19.78 mm
75%
24%
33.8 kph
0


Air Quality

AQI: 2 - Moderate
PM2.5: 20.84 μg/m3
PM10: 21.08 μg/m3
Carbon Monoxide: 474.17 μg/m3
Nitrogen Dioxide: 34.23 μg/m3
Sulphur Dioxide: 8.7 μg/m3
Ozone: 27.48 μg/m3

Astronomical

Sunrise: 7:11 AM
Sun Transit: 12:32 AM
Sunset: 5:53 PM
Daylight: 10 hrs 42 mins
Moonrise: 7:45 AM
Moon Transit: 1:29 PM
Moonset: 7:27 PM
Moon Phase: New
Moon Illumination: 1.3%

Best Times for Fishing or Hunting

Major Periods

2:03 AM - 4:33 AM
12:59 AM - 3:29 PM

Minor Periods

6:57 PM - 8:27 PM
7:15 AM - 8:45 AM

Action Rating: 4 out of 5

Thursday, February 19, 2026

Weather Forecast

Overcast
0.2°C
-1.9°C
-0.9°C
93%
0 mm
0%
0%
29.2 kph
0.4


Air Quality

AQI: 1 - Good
PM2.5: 5.13 μg/m3
PM10: 5.26 μg/m3
Carbon Monoxide: 389.33 μg/m3
Nitrogen Dioxide: 12.25 μg/m3
Sulphur Dioxide: 3.73 μg/m3
Ozone: 66.96 μg/m3

Astronomical

Sunrise: 7:10 AM
Sun Transit: 12:31 AM
Sunset: 5:54 PM
Daylight: 10 hrs 45 mins
Moonrise: 8:05 AM
Moon Transit: 4:07 PM
Moonset: 8:40 PM
Moon Phase: Waxing Crescent
Moon Illumination: 5.2%

Best Times for Fishing or Hunting

Major Periods

3:37 PM - 6:07 PM
3:37 PM - 6:07 PM

Minor Periods

8:10 PM - 9:40 PM
7:35 AM - 9:05 AM

Action Rating: 5 out of 5

Friday, February 20, 2026

Weather Forecast

Heavy rain
5.1°C
0.2°C
1.3°C
94%
23.01 mm
89%
7%
42.1 kph
0.3


Air Quality

AQI: 1 - Good
PM2.5: 5.65 μg/m3
PM10: 5.75 μg/m3
Carbon Monoxide: 340.83 μg/m3
Nitrogen Dioxide: 14.11 μg/m3
Sulphur Dioxide: 3.29 μg/m3
Ozone: 58.04 μg/m3

Astronomical

Sunrise: 7:08 AM
Sun Transit: 12:31 AM
Sunset: 5:56 PM
Daylight: 10 hrs 47 mins
Moonrise: 8:25 AM
Moon Transit: 3:01 PM
Moonset: 9:53 PM
Moon Phase: Waxing Crescent
Moon Illumination: 11.3%

Best Times for Fishing or Hunting

Major Periods

3:34 AM - 6:04 AM
2:31 PM - 5:01 PM

Minor Periods

9:23 PM - 10:53 PM
7:55 AM - 9:25 AM

Action Rating: 2 out of 5

Saturday, February 21, 2026

Weather Forecast

Light snow
1.3°C
-2.1°C
0.4°C
93%
1.26 mm
87%
46%
31.3 kph
0


Air Quality

AQI: 1 - Good
PM2.5: 7.81 μg/m3
PM10: 7.95 μg/m3
Carbon Monoxide: 292.58 μg/m3
Nitrogen Dioxide: 16.82 μg/m3
Sulphur Dioxide: 3.23 μg/m3
Ozone: 52.23 μg/m3

Astronomical

Sunrise: 7:07 AM
Sun Transit: 12:31 AM
Sunset: 5:57 PM
Daylight: 10 hrs 50 mins
Moonrise: 8:48 AM
Moon Transit: 3:50 PM
Moonset: 11:09 PM
Moon Phase: Waxing Crescent
Moon Illumination: 19.4%

Best Times for Fishing or Hunting

Major Periods

4:22 AM - 6:52 AM
3:20 PM - 5:50 PM

Minor Periods

12:00 AM - 12:00 AM
8:18 AM - 9:48 AM

Action Rating: 4 out of 5

The times presented here are based upon the solunar theory, which is the idea that the movements of fish and other animals are affected by the location of the sun and moon. The major periods are believed to be the times of the greatest animal activity and occur when the moon is directly overhead or underfoot (lunar transits). The minor periods also see increased activity and occur when the moon is rising or setting. The strongest activity occurs during full or new moons, and the weakest during quarter or three quarter moons. This is indicated by the Action Rating.

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