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

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Lake Ontario

Station Name: West Lake Ontario - Grimsby
Station Type: Buoy
Data Source: National Data Buoy Center

Elevation Above Sea Level: 240 feet / 73 meters

Nearest Address:
Grimsby, ON
Niagara Regional District County

GPS Coordinates: 43.25, -79.53

Nearby Water Temperatures

Eighteenmile Creek, Burt, NY (41.2 mi)
Buffalo River, Buffalo, NY (41.3 mi)
Erie Canal, Lockport, NY (42.7 mi)
Oak Orchard Creek, Medina, NY (57.8 mi)
Oak Orchard Creek, Kenyonville, NY (61.4 mi)
Cattaraugus Creek, Gowanda, NY (62.2 mi)
Johnson Creek, Kuckville, NY (64.1 mi)
Oak Orchard Creek, Kent, NY (67.6 mi)
Sandy Creek, North Hamlin, NY (81.4 mi)
Allegheny River, Salamanca, NY (86.2 mi)
Walnut Creek, Erie, PA (88.8 mi)
Northrup Creek, North Greece, NY (90.0 mi)
Erie Canal, Rochester, NY (95.1 mi)
Genesee River, Rochester, NY (96.7 mi)
Allen Creek, Brighton, NY (101.2 mi)

Weather for Grimsby, Ontario

Current Weather

2.6°C
Patchy rain nearby
Conditions: Patchy rain nearby
Humidity: 87%
Feels Like: -3.8°C
Wind: WSW 24.2 mph
Wind Gusts: 32.1 mph
Pressure: 29.48 in
Precipitation: 0 in
Cloud Cover: 0%
Visibility: 1 mi
UV Index: 0.8

Five Day Weather Forecast

Moderate rain
Fri
H: 6°C
L: -4°C
Overcast
Sat
H: 2°C
L: -5°C
Partly Cloudy
Sun
H: -1°C
L: -5°C
Partly Cloudy
Mon
H: -1°C
L: -6°C
Patchy rain nearby
Tue
H: 4°C
L: -1°C

Air Quality

AQI: 1 - Good
PM2.5: 2.45 μg/m3
PM10: 2.45 μg/m3
Carbon Monoxide: 194.85 μg/m3
Nitrogen Dioxide: 5.05 μg/m3
Sulphur Dioxide: 1.95 μg/m3
Ozone: 64 μg/m3

Astronomical

Sunrise: 7:46 AM
Sun Transit: 12:15 AM
Sunset: 4:45 PM
Daylight: 8 hrs 59 mins
Moonrise: 7:50 AM
Moon Transit: 11:56 AM
Moonset: 4:03 PM
Moon Phase: New
Moon Illumination: 1.1%

Best Times for Fishing or Hunting

Major Periods

12:27 AM - 2:57 AM
11:26 AM - 1:56 PM

Minor Periods

3:33 PM - 5:03 PM
7:20 AM - 8:50 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: Thu December 18, 2025, 11:53 PM
Expires: Fri December 19, 2025, 3:53 PM

Rain tonight, followed by rapidly falling temperatures Friday. What: Total rainfall amounts of 10 to 20 mm. Rapidly falling temperatures resulting in surfaces becoming icy and slippery. When: Tonight through Friday afternoon. Additional information: Rain will overspread the area tonight before changing over to flurries early Friday morning as temperatures rapidly fall below the freezing mark. This will be the result of a strong cold front passing through the area. Roads and walkways may become icy and slippery. Travel may become difficult at times. 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 warning - wind - 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: Thu December 18, 2025, 11:26 PM
Expires: Fri December 19, 2025, 3:26 PM

Strong winds expected Friday. What: Southwesterly to westerly winds gusting to 90 km/h. When: Friday morning through Friday evening. Additional information: The strongest wind gusts are expected to be near the lakeshore. Winds will diminish through Friday evening. ### Local utility outages 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.

Secure loose objects.


Friday, December 19, 2025

Weather Forecast

Conditions: Moderate rain
Average Temperature: 2.3°C
Average Humidity: 81%
Chance of Rain: 89%
Wind: 31.1 mph
UV Index: 0.2

Air Quality

AQI: 1 - Good
PM2.5: 3.13 μg/m3
PM10: 3.25 μg/m3
Carbon Monoxide: 186.69 μg/m3
Nitrogen Dioxide: 7.18 μg/m3
Sulphur Dioxide: 3.8 μg/m3
Ozone: 66.48 μg/m3

Astronomical

Sunrise: 7:46 AM
Sun Transit: 12:15 AM
Sunset: 4:45 PM
Daylight: 8 hrs 59 mins
Moonrise: 7:50 AM
Moon Transit: 11:56 AM
Moonset: 4:03 PM
Moon Phase: New
Moon Illumination: 1.1%

Best Times for Fishing or Hunting

Major Periods

12:27 AM - 2:57 AM
11:26 AM - 1:56 PM

Minor Periods

3:33 PM - 5:03 PM
7:20 AM - 8:50 AM

Action Rating: 5 out of 5

Saturday, December 20, 2025

Weather Forecast

Conditions: Overcast
Average Temperature: -1.6°C
Average Humidity: 73%
Chance of Rain: 0%
Wind: 27.1 mph
UV Index: 0.2

Air Quality

AQI: 1 - Good
PM2.5: 3.28 μg/m3
PM10: 3.38 μg/m3
Carbon Monoxide: 176.89 μg/m3
Nitrogen Dioxide: 8.18 μg/m3
Sulphur Dioxide: 4.05 μg/m3
Ozone: 68.4 μg/m3

Astronomical

Sunrise: 7:47 AM
Sun Transit: 12:15 AM
Sunset: 4:45 PM
Daylight: 8 hrs 59 mins
Moonrise: 8:42 AM
Moon Transit: 12:49 AM
Moonset: 4:59 PM
Moon Phase: New
Moon Illumination: 0.0%

Best Times for Fishing or Hunting

Major Periods

1:19 AM - 3:49 AM
12:19 AM - 2:49 PM

Minor Periods

4:29 PM - 5:59 PM
8:12 AM - 9:42 AM

Action Rating: 5 out of 5

Sunday, December 21, 2025

Weather Forecast

Conditions: Partly Cloudy
Average Temperature: -1.8°C
Average Humidity: 75%
Chance of Rain: 0%
Wind: 26.6 mph
UV Index: 0.2

Air Quality

AQI: 1 - Good
PM2.5: 4.77 μg/m3
PM10: 5.17 μg/m3
Carbon Monoxide: 181.97 μg/m3
Nitrogen Dioxide: 8.56 μg/m3
Sulphur Dioxide: 3.09 μg/m3
Ozone: 63 μg/m3

Astronomical

Sunrise: 7:47 AM
Sun Transit: 12:16 AM
Sunset: 4:46 PM
Daylight: 8 hrs 59 mins
Moonrise: 9:25 AM
Moon Transit: 1:41 PM
Moonset: 6:02 PM
Moon Phase: New
Moon Illumination: 1.5%

Best Times for Fishing or Hunting

Major Periods

2:12 AM - 4:42 AM
1:11 PM - 3:41 PM

Minor Periods

5:32 PM - 7:02 PM
8:55 AM - 10:25 AM

Action Rating: 3 out of 5

Monday, December 22, 2025

Weather Forecast

Conditions: Partly Cloudy
Average Temperature: -3.3°C
Average Humidity: 67%
Chance of Rain: 0%
Wind: 20.1 mph
UV Index: 0.2

Air Quality

AQI: 1 - Good
PM2.5: 3.43 μg/m3
PM10: 3.53 μg/m3
Carbon Monoxide: 185.63 μg/m3
Nitrogen Dioxide: 8.9 μg/m3
Sulphur Dioxide: 3.16 μg/m3
Ozone: 65.56 μg/m3

Astronomical

Sunrise: 7:48 AM
Sun Transit: 12:16 AM
Sunset: 4:46 PM
Daylight: 8 hrs 59 mins
Moonrise: 10:00 AM
Moon Transit: 2:31 PM
Moonset: 7:09 PM
Moon Phase: Waxing Crescent
Moon Illumination: 5.5%

Best Times for Fishing or Hunting

Major Periods

3:03 AM - 5:33 AM
2:01 PM - 4:31 PM

Minor Periods

6:39 PM - 8:09 PM
9:30 AM - 11:00 AM

Action Rating: 3 out of 5

Tuesday, December 23, 2025

Weather Forecast

Conditions: Patchy rain nearby
Average Temperature: 1.4°C
Average Humidity: 73%
Chance of Rain: 77%
Wind: 23 mph
UV Index: 0

Air Quality

AQI: 1 - Good
PM2.5: 8.79 μg/m3
PM10: 9.61 μg/m3
Carbon Monoxide: 246.27 μg/m3
Nitrogen Dioxide: 18.56 μg/m3
Sulphur Dioxide: 6.07 μg/m3
Ozone: 47.23 μg/m3

Astronomical

Sunrise: 7:48 AM
Sun Transit: 12:17 AM
Sunset: 4:47 PM
Daylight: 8 hrs 59 mins
Moonrise: 10:29 AM
Moon Transit: 3:19 PM
Moonset: 8:19 PM
Moon Phase: Waxing Crescent
Moon Illumination: 11.7%

Best Times for Fishing or Hunting

Major Periods

3:52 AM - 6:22 AM
2:49 PM - 5:19 PM

Minor Periods

7:49 PM - 9:19 PM
9:59 AM - 11:29 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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