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: 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

-3.6°C
Cloudy
Conditions: Cloudy
Humidity: 68%
Heat Index: -3.6°C
Feels Like: -10°C
Wind: N 8.7 mph
Wind Gusts: -7.2 kph
Wind Chill: -10°C
Air Pressure: 1027.1 millibars
Dew Point: -8.8°C
Chance of Precipitation: 10%
Precipitation: 0 in
Cloud Cover: 0%
Visibility: -12.2 km
UV Index: 0

Five Day Weather Forecast

Partly Cloudy
Thu
H: 2°C
L: -4°C
Moderate or heavy snow showers
Fri
H: -5°C
L: -5°C
Partly Cloudy
Sat
H: 0°C
L: -5°C
Moderate rain
Sun
H: 3°C
L: -2°C
Blowing snow
Mon
H: 3°C
L: -6°C

Air Quality

AQI: 1 - Good
PM2.5: 3.35 μg/m3
PM10: 3.55 μg/m3
Carbon Monoxide: 226.85 μg/m3
Nitrogen Dioxide: 12.35 μg/m3
Sulphur Dioxide: 5.15 μg/m3
Ozone: 68 μg/m3

Astronomical

Sunrise: 7:49 AM
Sun Transit: 12:18 AM
Sunset: 4:48 PM
Daylight: 8 hrs 59 mins
Moonrise: 11:14 AM
Moon Transit: 4:49 PM
Moonset: 10:37 PM
Moon Phase: Waxing Crescent
Moon Illumination: 29.7%

Best Times for Fishing or Hunting

Major Periods

5:23 AM - 7:53 AM
4:19 PM - 6:49 PM

Minor Periods

10:07 PM - 11:37 PM
10:44 AM - 12:14 AM

Action Rating: 4 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 25, 2025, 11:01 AM
Expires: Fri December 26, 2025, 3:01 AM

A mix of ice pellets and snow likely Friday. What: Snowfall and ice pellet accumulations near 5 cm. Risk of freezing rain. When: Friday midday into Friday evening. Additional information: A mix of ice pellets and snow is expected to begin midday Friday and end from west to east through Friday evening. Snowfall amounts may be reduced due to the mixing with ice pellets at times. There is also the risk of freezing rain Friday afternoon or evening. Roads and walkways could become icy and slippery. Travel could be difficult due to accumulating snow. Motorists should expect difficult winter driving conditions and adjust travel plans accordingly. ### 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: Thu December 25, 2025, 5:07 AM
Expires: Thu December 25, 2025, 9:07 PM

A mix of ice pellets and snow likely Friday. What: Snowfall accumulations near 5 cm. Risk of freezing rain. When: Friday afternoon into Friday evening. Additional information: A mix of ice pellets and snow is expected to begin Friday afternoon and end from west to east through Friday evening. Snowfall amounts may be reduced due to the mixing with ice pellets at times. There is also the risk of freezing rain Friday afternoon or evening. Roads and walkways could become icy and slippery. Travel could be difficult due to accumulating snow. Motorists should expect difficult winter driving conditions and adjust travel plans accordingly. ### 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: Wed December 24, 2025, 10:59 PM
Expires: Thu December 25, 2025, 2:59 PM

A mix of ice pellets and snow likely Friday. What: Snowfall amounts of 5 cm. Risk of freezing rain. When: Friday afternoon into Friday evening. Additional information: A mix of ice pellets and snow is expected to begin Friday afternoon and end from west to east through Friday evening. Snowfall amounts may be reduced due to the mixing with ice pellets at times. There is also the risk of freezing rain Friday afternoon or evening. Roads and walkways could become icy and slippery. Travel could be difficult due to accumulating snow. Motorists should expect difficult winter driving conditions and adjust travel plans accordingly. ### 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.


Thursday, December 25, 2025

Weather Forecast

Conditions: Partly Cloudy
Average Temperature: -0.5°C
Average Humidity: 76%
Chance of Rain: 0%
Wind: 19 mph
UV Index: 0.2

Air Quality

AQI: 1 - Good
PM2.5: 6.59 μg/m3
PM10: 6.87 μg/m3
Carbon Monoxide: 234.61 μg/m3
Nitrogen Dioxide: 15.71 μg/m3
Sulphur Dioxide: 5.59 μg/m3
Ozone: 48.6 μg/m3

Astronomical

Sunrise: 7:49 AM
Sun Transit: 12:18 AM
Sunset: 4:48 PM
Daylight: 8 hrs 59 mins
Moonrise: 11:14 AM
Moon Transit: 4:49 PM
Moonset: 10:37 PM
Moon Phase: Waxing Crescent
Moon Illumination: 29.7%

Best Times for Fishing or Hunting

Major Periods

5:23 AM - 7:53 AM
4:19 PM - 6:49 PM

Minor Periods

10:07 PM - 11:37 PM
10:44 AM - 12:14 AM

Action Rating: 4 out of 5

Friday, December 26, 2025

Weather Forecast

Conditions: Moderate or heavy snow showers
Average Temperature: -4.8°C
Average Humidity: 67%
Chance of Rain: 78%
Wind: 24.4 mph
UV Index: 0.1

Air Quality

AQI: 1 - Good
PM2.5: 2.99 μg/m3
PM10: 3.13 μg/m3
Carbon Monoxide: 261.45 μg/m3
Nitrogen Dioxide: 8.1 μg/m3
Sulphur Dioxide: 3.07 μg/m3
Ozone: 71.08 μg/m3

Astronomical

Sunrise: 7:49 AM
Sun Transit: 12:18 AM
Sunset: 4:49 PM
Daylight: 9 hrs mins
Moonrise: 11:34 AM
Moon Transit: 12:00 AM
Moonset: 11:47 PM
Moon Phase: First Quarter
Moon Illumination: 40.5%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
6:08 AM - 8:38 AM

Minor Periods

12:00 AM - 12:00 AM
11:04 AM - 12:34 AM

Action Rating: 2 out of 5

Saturday, December 27, 2025

Weather Forecast

Conditions: Partly Cloudy
Average Temperature: -2°C
Average Humidity: 83%
Chance of Rain: 0%
Wind: 17.4 mph
UV Index: 0.2

Air Quality

AQI: 1 - Good
PM2.5: 6.99 μg/m3
PM10: 7.08 μg/m3
Carbon Monoxide: 413.97 μg/m3
Nitrogen Dioxide: 16.09 μg/m3
Sulphur Dioxide: 5.16 μg/m3
Ozone: 51.52 μg/m3

Astronomical

Sunrise: 7:49 AM
Sun Transit: 12:19 AM
Sunset: 4:50 PM
Daylight: 9 hrs mins
Moonrise: 11:54 AM
Moon Transit: 4:23 AM
Moonset: 12:47 AM
Moon Phase: First Quarter
Moon Illumination: 51.8%

Best Times for Fishing or Hunting

Major Periods

3:53 AM - 6:23 AM
3:53 AM - 6:23 AM

Minor Periods

11:24 AM - 12:54 AM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Sunday, December 28, 2025

Weather Forecast

Conditions: Moderate rain
Average Temperature: 1.1°C
Average Humidity: 92%
Chance of Rain: 68%
Wind: 21.7 mph
UV Index: 0.1

Air Quality

AQI: 1 - Good
PM2.5: 13.29 μg/m3
PM10: 13.31 μg/m3
Carbon Monoxide: 460.3 μg/m3
Nitrogen Dioxide: 29.31 μg/m3
Sulphur Dioxide: 8.09 μg/m3
Ozone: 18.24 μg/m3

Astronomical

Sunrise: 7:50 AM
Sun Transit: 12:19 AM
Sunset: 4:50 PM
Daylight: 9 hrs 1 mins
Moonrise: 12:15 AM
Moon Transit: 7:07 PM
Moonset: 12:59 AM
Moon Phase: First Quarter
Moon Illumination: 63.0%

Best Times for Fishing or Hunting

Major Periods

7:39 AM - 10:09 AM
6:37 PM - 9:07 PM

Minor Periods

11:45 AM - 1:15 PM
12:29 AM - 1:59 AM

Action Rating: 3 out of 5

Monday, December 29, 2025

Weather Forecast

Conditions: Blowing snow
Average Temperature: -0.3°C
Average Humidity: 86%
Chance of Rain: 88%
Wind: 34.9 mph
UV Index: 0

Air Quality

AQI: 1 - Good
PM2.5: 6.26 μg/m3
PM10: 6.29 μg/m3
Carbon Monoxide: 383.85 μg/m3
Nitrogen Dioxide: 21.64 μg/m3
Sulphur Dioxide: 9.73 μg/m3
Ozone: 16.92 μg/m3

Astronomical

Sunrise: 7:50 AM
Sun Transit: 12:20 AM
Sunset: 4:51 PM
Daylight: 9 hrs 1 mins
Moonrise: 12:40 AM
Moon Transit: 8:00 PM
Moonset: 2:15 AM
Moon Phase: First Quarter
Moon Illumination: 73.5%

Best Times for Fishing or Hunting

Major Periods

8:30 AM - 11:00 AM
7:30 PM - 10:00 PM

Minor Periods

12:10 AM - 1:40 PM
1:45 AM - 3:15 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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