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

-9.7°C
Clear
Clear
-15.7°C
-12.7°C
64%
W 12.6 kph
24.2 kph
-19.7°C
-17.2°C
0 mm
0%
10 km
1022 mbar
0

Five Day Weather Forecast

Partly Cloudy
Sun
H: -6°C
L: -13°C
Overcast
Mon
H: -6°C
L: -18°C
Cloudy
Tue
H: -3°C
L: -11°C
Partly Cloudy
Wed
H: -6°C
L: -14°C
Cloudy
Thu
H: -5°C
L: -11°C

Air Quality

AQI: 1 - Good
PM2.5: 6.45 μg/m3
PM10: 6.55 μg/m3
Carbon Monoxide: 179.85 μg/m3
Nitrogen Dioxide: 10.85 μg/m3
Sulphur Dioxide: 2.85 μg/m3
Ozone: 67 μg/m3

Astronomical

Sunrise: 7:33 AM
Sun Transit: 12:31 AM
Sunset: 5:30 PM
Daylight: 9 hrs 57 mins
Moonrise: 5:20 PM
Moon Transit: 12:00 AM
Moonset: 7:37 AM
Moon Phase: Full
Moon Illumination: 99.9%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
1:21 PM - 3:51 PM

Minor Periods

4:50 PM - 6:20 PM
7:07 AM - 8:37 AM

Action Rating: 4 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: Sun February 1, 2026, 10:58 AM
Expires: Mon February 2, 2026, 2:58 AM

A period of very cold wind chills continues. What: Wind chills near minus 30. When: Overnight into early Monday morning. ### 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. Check on older family, friends and neighbours. If it’s too cold for you to stay outside, it’s too cold for your pet to stay outside. Watch for colour changes on fingers and toes, pain, numbness, a tingling sensation, or swelling. If present, move indoors and begin warming.


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: Sun February 1, 2026, 5:55 PM
Expires: Mon February 2, 2026, 9:55 AM

A period of very cold wind chills is expected. What: Wind chills near minus 30. When: Overnight into early Monday morning. ### 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. Check on older family, friends and neighbours. If it’s too cold for you to stay outside, it’s too cold for your pet to stay outside. Watch for colour changes on fingers and toes, pain, numbness, a tingling sensation, or swelling. If present, move indoors and begin warming.


Sunday, February 1, 2026

Weather Forecast

Partly Cloudy
-5.8°C
-12.5°C
-10°C
71%
0 mm
0%
0%
20.9 kph
0.4


Air Quality

AQI: 1 - Good
PM2.5: 6.21 μg/m3
PM10: 6.4 μg/m3
Carbon Monoxide: 290.33 μg/m3
Nitrogen Dioxide: 16.69 μg/m3
Sulphur Dioxide: 5.75 μg/m3
Ozone: 64.64 μg/m3

Astronomical

Sunrise: 7:33 AM
Sun Transit: 12:31 AM
Sunset: 5:30 PM
Daylight: 9 hrs 57 mins
Moonrise: 5:20 PM
Moon Transit: 12:00 AM
Moonset: 7:37 AM
Moon Phase: Full
Moon Illumination: 99.9%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
1:21 PM - 3:51 PM

Minor Periods

4:50 PM - 6:20 PM
7:07 AM - 8:37 AM

Action Rating: 4 out of 5

Monday, February 2, 2026

Weather Forecast

Overcast
-5.9°C
-18.2°C
-12°C
77%
0 mm
0%
0%
22.7 kph
0.4


Air Quality

AQI: 1 - Good
PM2.5: 6.73 μg/m3
PM10: 6.84 μg/m3
Carbon Monoxide: 256.05 μg/m3
Nitrogen Dioxide: 14.46 μg/m3
Sulphur Dioxide: 4.27 μg/m3
Ozone: 65.52 μg/m3

Astronomical

Sunrise: 7:32 AM
Sun Transit: 12:31 AM
Sunset: 5:31 PM
Daylight: 9 hrs 59 mins
Moonrise: 6:37 PM
Moon Transit: 12:50 AM
Moonset: 8:07 AM
Moon Phase: Full
Moon Illumination: 99.4%

Best Times for Fishing or Hunting

Major Periods

12:20 AM - 2:50 AM
2:13 PM - 4:43 PM

Minor Periods

6:07 PM - 7:37 PM
7:37 AM - 9:07 AM

Action Rating: 4 out of 5

Tuesday, February 3, 2026

Weather Forecast

Cloudy
-3.1°C
-10.5°C
-6.4°C
85%
0 mm
0%
0%
23 kph
0.4


Air Quality

AQI: 1 - Good
PM2.5: 4.62 μg/m3
PM10: 4.64 μg/m3
Carbon Monoxide: 264.41 μg/m3
Nitrogen Dioxide: 10.75 μg/m3
Sulphur Dioxide: 3.57 μg/m3
Ozone: 62.64 μg/m3

Astronomical

Sunrise: 7:31 AM
Sun Transit: 12:31 AM
Sunset: 5:33 PM
Daylight: 10 hrs 2 mins
Moonrise: 7:50 PM
Moon Transit: 1:40 AM
Moonset: 8:30 AM
Moon Phase: Full
Moon Illumination: 96.3%

Best Times for Fishing or Hunting

Major Periods

1:10 AM - 3:40 AM
3:00 PM - 5:30 PM

Minor Periods

7:20 PM - 8:50 PM
8:00 AM - 9:30 AM

Action Rating: 5 out of 5

Wednesday, February 4, 2026

Weather Forecast

Partly Cloudy
-5.9°C
-13.8°C
-9.7°C
82%
0 mm
0%
0%
19.8 kph
0.4


Air Quality

AQI: 1 - Good
PM2.5: 3.91 μg/m3
PM10: 3.98 μg/m3
Carbon Monoxide: 208.65 μg/m3
Nitrogen Dioxide: 9.34 μg/m3
Sulphur Dioxide: 3.25 μg/m3
Ozone: 65.12 μg/m3

Astronomical

Sunrise: 7:30 AM
Sun Transit: 12:32 AM
Sunset: 5:34 PM
Daylight: 10 hrs 4 mins
Moonrise: 9:00 PM
Moon Transit: 2:26 AM
Moonset: 8:51 AM
Moon Phase: Full
Moon Illumination: 90.9%

Best Times for Fishing or Hunting

Major Periods

1:56 AM - 4:26 AM
3:45 PM - 6:15 PM

Minor Periods

8:30 PM - 10:00 PM
8:21 AM - 9:51 AM

Action Rating: 3 out of 5

Thursday, February 5, 2026

Weather Forecast

Cloudy
-4.7°C
-10.5°C
-8.2°C
87%
0.1 mm
0%
18%
29.2 kph
0.4


Air Quality

AQI: 1 - Good
PM2.5: 4.67 μg/m3
PM10: 4.73 μg/m3
Carbon Monoxide: 215.89 μg/m3
Nitrogen Dioxide: 10.73 μg/m3
Sulphur Dioxide: 3.09 μg/m3
Ozone: 65 μg/m3

Astronomical

Sunrise: 7:29 AM
Sun Transit: 12:32 AM
Sunset: 5:36 PM
Daylight: 10 hrs 7 mins
Moonrise: 10:07 PM
Moon Transit: 3:10 AM
Moonset: 9:09 AM
Moon Phase: Waning Gibbous
Moon Illumination: 83.4%

Best Times for Fishing or Hunting

Major Periods

2:40 AM - 5:10 AM
4:28 PM - 6:58 PM

Minor Periods

9:37 PM - 11:07 PM
8:39 AM - 10:09 AM

Action Rating: 2 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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