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

4.8°C
Clear
Clear
2.2°C
4.1°C
80%
WNW 11.2 kph
20.3 kph
1.8°C
2°C
0 mm
0%
10 km
1012 mbar
0

Five Day Weather Forecast

Patchy rain nearby
Fri
H: 12°C
L: 4°C
Patchy rain nearby
Sat
H: 14°C
L: 7°C
Patchy rain nearby
Sun
H: 12°C
L: 7°C
Partly Cloudy
Mon
H: 11°C
L: 6°C
Sunny
Tue
H: 10°C
L: 3°C

Air Quality

PM2.5: 5.55 μg/m3
PM10: 5.65 μg/m3
Carbon Monoxide: 159.85 μg/m3
Nitrogen Dioxide: 14.65 μg/m3
Sulphur Dioxide: 2.75 μg/m3
Ozone: 40 μg/m3

Astronomical

Sunrise: 6:02 AM
Sun Transit: 1:14 PM
Sunset: 8:28 PM
Daylight: 14 hrs 26 mins
Moonrise: 1:58 AM
Moon Transit: 6:30 AM
Moonset: 11:10 AM
Moon Phase: Last Quarter
Moon Illumination: 47.9%

Best Times for Fishing or Hunting

Major Periods

6:00 AM - 8:30 AM
7:51 PM - 10:21 PM

Minor Periods

10:40 AM - 12:10 AM
1:28 AM - 2:58 AM

Action Rating: 3 out of 5

yellow advisory - frost - in effect

Service Notice – February 2026: The Environment and Climate Change Canada (ECCC) CAP Service undergoes changes from time to time as the business of alerting evolves. For 2026, changes are expected to include... 1) ECCC's initiative to introduce free-form polygons to represent the true threat area of a weather hazard is tentatively set for Spring 2026 deployment. Data changes will appear in CAP following this deployment and 2) 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 – février 2026: Le service du PAC d’Environnement et Changement climatique Canada (ECCC) subit périodiquement des changements à mesure que le système d’alerte évolue. Pour 2026, il y aura des changements incluant... 1) l’initiative d’ECCC visant à introduire des polygones libres pour représenter la véritable zone de menace d’un danger météorologique devrait être déployée provisoirement au printemps 2026. Des changements de données apparaîtront dans le PAC à la suite de ce déploiement et 2) 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 May 7, 2026, 4:52 AM
Expires: Thu May 7, 2026, 8:52 PM

Frost may damage some crops in frost-prone areas. Patchy frost is expected this morning as temperatures drop to near or below the freezing mark. Frost is possible again tonight in some areas. ### Damage to plants, trees, and crops is 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.

Cover up plants, especially those in frost-prone areas.


yellow advisory - frost - in effect

Service Notice – February 2026: The Environment and Climate Change Canada (ECCC) CAP Service undergoes changes from time to time as the business of alerting evolves. For 2026, changes are expected to include... 1) ECCC's initiative to introduce free-form polygons to represent the true threat area of a weather hazard is tentatively set for Spring 2026 deployment. Data changes will appear in CAP following this deployment and 2) 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 – février 2026: Le service du PAC d’Environnement et Changement climatique Canada (ECCC) subit périodiquement des changements à mesure que le système d’alerte évolue. Pour 2026, il y aura des changements incluant... 1) l’initiative d’ECCC visant à introduire des polygones libres pour représenter la véritable zone de menace d’un danger météorologique devrait être déployée provisoirement au printemps 2026. Des changements de données apparaîtront dans le PAC à la suite de ce déploiement et 2) 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 May 7, 2026, 8:37 AM
Expires: Fri May 8, 2026, 12:37 AM

Frost may damage some crops in frost-prone areas. Patchy frost is expected overnight and Friday morning as temperatures drop to near or below the freezing mark. ### Damage to plants, trees, and crops is 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.

Cover up plants, especially those in frost-prone areas.


yellow advisory - frost - in effect

Service Notice – February 2026: The Environment and Climate Change Canada (ECCC) CAP Service undergoes changes from time to time as the business of alerting evolves. For 2026, changes are expected to include... 1) ECCC's initiative to introduce free-form polygons to represent the true threat area of a weather hazard is tentatively set for Spring 2026 deployment. Data changes will appear in CAP following this deployment and 2) 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 – février 2026: Le service du PAC d’Environnement et Changement climatique Canada (ECCC) subit périodiquement des changements à mesure que le système d’alerte évolue. Pour 2026, il y aura des changements incluant... 1) l’initiative d’ECCC visant à introduire des polygones libres pour représenter la véritable zone de menace d’un danger météorologique devrait être déployée provisoirement au printemps 2026. Des changements de données apparaîtront dans le PAC à la suite de ce déploiement et 2) 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 May 7, 2026, 3:32 PM
Expires: Fri May 8, 2026, 7:32 AM

Frost may damage some crops in frost-prone areas. Patchy frost is expected overnight and Friday morning as temperatures drop to near or below the freezing mark. ### Damage to plants, trees, and crops is 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.

Cover up plants, especially those in frost-prone areas.


yellow advisory - frost - in effect

Service Notice – February 2026: The Environment and Climate Change Canada (ECCC) CAP Service undergoes changes from time to time as the business of alerting evolves. For 2026, changes are expected to include... 1) ECCC's initiative to introduce free-form polygons to represent the true threat area of a weather hazard is tentatively set for Spring 2026 deployment. Data changes will appear in CAP following this deployment and 2) 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 – février 2026: Le service du PAC d’Environnement et Changement climatique Canada (ECCC) subit périodiquement des changements à mesure que le système d’alerte évolue. Pour 2026, il y aura des changements incluant... 1) l’initiative d’ECCC visant à introduire des polygones libres pour représenter la véritable zone de menace d’un danger météorologique devrait être déployée provisoirement au printemps 2026. Des changements de données apparaîtront dans le PAC à la suite de ce déploiement et 2) 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 May 7, 2026, 3:22 PM
Expires: Fri May 8, 2026, 7:22 AM

Frost may damage some crops in frost-prone areas. Patchy frost is expected overnight and Friday morning as temperatures drop to near or below the freezing mark. ### Damage to plants, trees, and crops is 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.

Cover up plants, especially those in frost-prone areas.


Friday, May 8, 2026

Weather Forecast

Patchy rain nearby
11.6°C
3.7°C
7.6°C
77%
1.43 mm
92%
0%
26.6 kph
6


Air Quality

AQI: 1 - Good
PM2.5: 13.11 μg/m3
PM10: 13.41 μg/m3
Carbon Monoxide: 168.81 μg/m3
Nitrogen Dioxide: 22.58 μg/m3
Sulphur Dioxide: 5.35 μg/m3
Ozone: 53.16 μg/m3

Astronomical

Sunrise: 6:02 AM
Sun Transit: 1:14 PM
Sunset: 8:28 PM
Daylight: 14 hrs 26 mins
Moonrise: 1:58 AM
Moon Transit: 6:30 AM
Moonset: 11:10 AM
Moon Phase: Last Quarter
Moon Illumination: 47.9%

Best Times for Fishing or Hunting

Major Periods

6:00 AM - 8:30 AM
7:51 PM - 10:21 PM

Minor Periods

10:40 AM - 12:10 AM
1:28 AM - 2:58 AM

Action Rating: 3 out of 5

Saturday, May 9, 2026

Weather Forecast

Patchy rain nearby
14°C
7.2°C
10.2°C
81%
2.08 mm
82%
0%
31.7 kph
6


Air Quality

AQI: 2 - Moderate
PM2.5: 18.38 μg/m3
PM10: 18.93 μg/m3
Carbon Monoxide: 179.33 μg/m3
Nitrogen Dioxide: 23.65 μg/m3
Sulphur Dioxide: 5.13 μg/m3
Ozone: 62.36 μg/m3

Astronomical

Sunrise: 6:01 AM
Sun Transit: 1:14 PM
Sunset: 8:29 PM
Daylight: 14 hrs 28 mins
Moonrise: 2:27 AM
Moon Transit: 7:17 AM
Moonset: 12:18 AM
Moon Phase: Last Quarter
Moon Illumination: 36.7%

Best Times for Fishing or Hunting

Major Periods

6:47 AM - 9:17 AM
8:36 PM - 11:06 PM

Minor Periods

11:48 AM - 1:18 PM
1:57 AM - 3:27 AM

Action Rating: 3 out of 5

Sunday, May 10, 2026

Weather Forecast

Patchy rain nearby
11.8°C
6.5°C
9.2°C
73%
0.66 mm
88%
0%
11.2 kph
6.6


Air Quality

AQI: 2 - Moderate
PM2.5: 25.69 μg/m3
PM10: 26.5 μg/m3
Carbon Monoxide: 370.09 μg/m3
Nitrogen Dioxide: 28.2 μg/m3
Sulphur Dioxide: 6.97 μg/m3
Ozone: 53.96 μg/m3

Astronomical

Sunrise: 6:00 AM
Sun Transit: 1:14 PM
Sunset: 8:30 PM
Daylight: 14 hrs 31 mins
Moonrise: 2:50 AM
Moon Transit: 8:02 AM
Moonset: 1:25 PM
Moon Phase: Last Quarter
Moon Illumination: 26.2%

Best Times for Fishing or Hunting

Major Periods

7:32 AM - 10:02 AM
9:21 PM - 11:51 PM

Minor Periods

12:55 AM - 2:25 PM
2:20 AM - 3:50 AM

Action Rating: 2 out of 5

Monday, May 11, 2026

Weather Forecast

Partly Cloudy
10.7°C
5.6°C
7.8°C
66%
0.1 mm
0%
0%
19.8 kph
6


Air Quality

AQI: 2 - Moderate
PM2.5: 15.64 μg/m3
PM10: 16.15 μg/m3
Carbon Monoxide: 300.21 μg/m3
Nitrogen Dioxide: 33.31 μg/m3
Sulphur Dioxide: 8.46 μg/m3
Ozone: 35.38 μg/m3

Astronomical

Sunrise: 5:59 AM
Sun Transit: 1:14 PM
Sunset: 8:31 PM
Daylight: 14 hrs 33 mins
Moonrise: 3:11 AM
Moon Transit: 8:47 AM
Moonset: 2:35 PM
Moon Phase: Last Quarter
Moon Illumination: 16.9%

Best Times for Fishing or Hunting

Major Periods

8:17 AM - 10:47 AM
12:00 AM - 12:00 AM

Minor Periods

2:05 PM - 3:35 PM
2:41 AM - 4:11 AM

Action Rating: 2 out of 5

Tuesday, May 12, 2026

Weather Forecast

Sunny
10.1°C
3.2°C
6°C
66%
0 mm
0%
0%
22.3 kph
0.7


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 5:57 AM
Sun Transit: 1:14 PM
Sunset: 8:33 PM
Daylight: 14 hrs 35 mins
Moonrise: 3:31 AM
Moon Transit: 9:41 PM
Moonset: 3:46 PM
Moon Phase: Waning Crescent
Moon Illumination: 9.3%

Best Times for Fishing or Hunting

Major Periods

9:11 PM - 11:41 PM
9:11 PM - 11:41 PM

Minor Periods

3:16 PM - 4:46 PM
3:01 AM - 4:31 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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