Water Temperature of Lake Ontario in Grimsby, Ontario

Current Water Temperature

24.3°C

Measurement Time: Wednesday, July 16, 2025, 3:00 AM EDT

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

21.7°C
Fog
Conditions: Fog
Humidity: 87%
Feels Like: 21.7°C
Wind: SW 4.5 mph
Wind Gusts: 7.6 mph
Pressure: 29.96 in
Precipitation: 0 in
Cloud Cover: 0%
Visibility: 6 mi
UV Index: 0.3

Five Day Weather Forecast

Partly Cloudy
Wed
H: 32°C
L: 18°C
Heavy rain
Thu
H: 29°C
L: 17°C
Sunny
Fri
H: 25°C
L: 15°C
Sunny
Sat
H: 26°C
L: 13°C
Patchy rain nearby
Sun
H: 25°C
L: 20°C

Air Quality

AQI: 2 - Moderate
PM2.5: 48.1 μg/m3
PM10: 49.21 μg/m3
Carbon Monoxide: 479.15 μg/m3
Nitrogen Dioxide: 16.65 μg/m3
Sulphur Dioxide: 28.68 μg/m3
Ozone: 159 μg/m3

Astronomical

Sunrise: 5:53 AM
Sun Transit: 1:24 PM
Sunset: 8:55 PM
Daylight: 15 hrs 2 mins
Moonrise: 12:36 AM
Moon Transit: 1:15 AM
Moonset: 12:16 AM
Moon Phase: Waning Gibbous
Moon Illumination: 55.7%

Best Times for Fishing or Hunting

Major Periods

12:45 AM - 3:15 AM
12:45 AM - 3:15 AM

Minor Periods

11:46 AM - 1:16 PM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Heat Advisory issued July 16 at 2:22AM EDT until July 16 at 8:00PM EDT by NWS Buffalo NY

Effective: Wed July 16, 2025, 2:22 AM
Expires: Wed July 16, 2025, 8:00 PM

* WHAT...Heat index values in the mid to upper 90s expected. * WHERE...Niagara, Orleans, Monroe, Wayne, Northern Cayuga, Oswego, Jefferson, Livingston, and Ontario Counties. * WHEN...From 11 AM this morning to 8 PM EDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat related illnesses to occur.

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. This is especially true during hot weather when car interiors can reach lethal temperatures in a matter of minutes. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1.


avertissement de chaleur en vigueur

Service Notice – June 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 planned for deployment for later in 2025. Data changes will appear in CAP-CP upon this deployment, 2) SAME event codes for a few alert types are updated and 3) 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 – juin 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 prévue d’être déployée plus tard en 2025. Des changements aux données apparaîtront dans le PC-PAC lors de ce déploiement, 2) des codes d’événement MSSC pour quelques types d’alerte ont été mis à jour et 3) 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 July 16, 2025, 12:37 AM
Expires: Wed July 16, 2025, 4:37 PM

Humidex values reaching 35 are expected for more than 5 days. A prolonged period of hot and humidity continues. What: Daytime highs of 31 to 34 degrees Celsius and a humidex of 37 to 42. Overnight lows of 19 to 21 degrees Celsius, providing little relief from the heat. When: Continuing through Thursday. Additional information: A cooler airmass is expected to arrive on Thursday night bringing an end to this heat event. ### For more information: https://www.canada.ca/en/health-canada/services/climate-change-health/extreme-heat/how-protect-yourself.html https://www.canada.ca/en/health-canada/services/climate-change-health/extreme-heat/who-is-at-risk.html 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.

Take action to protect yourself and others – extreme heat can affect everyone’s health. Determine if you or others around you are at greater risk of heat illness. Check on older adults, those living alone and other at-risk people in-person or on the phone multiple times a day. Watch for the early signs of heat exhaustion in yourself and others. Signs may include headache, nausea, dizziness, thirst, dark urine and intense fatigue. Stop your activity and drink water. Heat stroke is a medical emergency! Call 9-1-1 or your emergency health provider if you, or someone around you, is showing signs of heat stroke which can include red and hot skin, dizziness, nausea, confusion and change in consciousness. While you wait for medical attention, try to cool the person by moving them to a cool place, removing extra clothing, applying cold water or ice packs around the body. Drink water often and before you feel thirsty to replace fluids. Close blinds, or shades and open windows if outside is cooler than inside. Turn on air conditioning, use a fan, or move to a cooler area of your living space. If your living space is hot, move to a cool public space such as a cooling centre, community centre, library or shaded park. Follow the advice of your region’s public health authority. Plan and schedule outdoor activities during the coolest parts of the day. Limit direct exposure to the sun and heat. Wear lightweight, light-coloured, loose-fitting clothing and a wide-brimmed hat. Never leave people, especially children, or pets inside a parked vehicle. Check the vehicle before locking to make sure no one is left behind.


avertissement de chaleur en vigueur

Service Notice – June 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 planned for deployment for later in 2025. Data changes will appear in CAP-CP upon this deployment, 2) SAME event codes for a few alert types are updated and 3) 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 – juin 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 prévue d’être déployée plus tard en 2025. Des changements aux données apparaîtront dans le PC-PAC lors de ce déploiement, 2) des codes d’événement MSSC pour quelques types d’alerte ont été mis à jour et 3) 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 July 15, 2025, 6:13 PM
Expires: Wed July 16, 2025, 10:13 AM

Humidex values reaching 35 are expected for more than 5 days. A prolonged period of hot and humidity continues. What: Daytime highs of 31 to 34 degrees Celsius and a humidex of 37 to 42. Overnight lows of 19 to 21 degrees Celsius, providing little relief from the heat. When: Continuing through to Thursday. Additional information: A cooler airmass is expected to arrive on Thursday night bringing an end to this heat event. ### For more information: https://www.canada.ca/en/health-canada/services/climate-change-health/extreme-heat/how-protect-yourself.html https://www.canada.ca/en/health-canada/services/climate-change-health/extreme-heat/who-is-at-risk.html 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.

Take action to protect yourself and others – extreme heat can affect everyone’s health. Determine if you or others around you are at greater risk of heat illness. Check on older adults, those living alone and other at-risk people in-person or on the phone multiple times a day. Watch for the early signs of heat exhaustion in yourself and others. Signs may include headache, nausea, dizziness, thirst, dark urine and intense fatigue. Stop your activity and drink water. Heat stroke is a medical emergency! Call 9-1-1 or your emergency health provider if you, or someone around you, is showing signs of heat stroke which can include red and hot skin, dizziness, nausea, confusion and change in consciousness. While you wait for medical attention, try to cool the person by moving them to a cool place, removing extra clothing, applying cold water or ice packs around the body. Drink water often and before you feel thirsty to replace fluids. Close blinds, or shades and open windows if outside is cooler than inside. Turn on air conditioning, use a fan, or move to a cooler area of your living space. If your living space is hot, move to a cool public space such as a cooling centre, community centre, library or shaded park. Follow the advice of your region’s public health authority. Plan and schedule outdoor activities during the coolest parts of the day. Limit direct exposure to the sun and heat. Wear lightweight, light-coloured, loose-fitting clothing and a wide-brimmed hat. Never leave people, especially children, or pets inside a parked vehicle. Check the vehicle before locking to make sure no one is left behind.


Wednesday, July 16, 2025

Weather Forecast

Conditions: Partly Cloudy
Average Temperature: 23.9°C
Average Humidity: 82%
Chance of Rain: 0%
Wind: 17.7 mph
UV Index: 2.2

Air Quality

AQI: 3 - Unhealthy for Sensitive Groups
PM2.5: 48.19 μg/m3
PM10: 49.34 μg/m3
Carbon Monoxide: 491.66 μg/m3
Nitrogen Dioxide: 27.45 μg/m3
Sulphur Dioxide: 14.55 μg/m3
Ozone: 127.36 μg/m3

Astronomical

Sunrise: 5:53 AM
Sun Transit: 1:24 PM
Sunset: 8:55 PM
Daylight: 15 hrs 2 mins
Moonrise: 12:36 AM
Moon Transit: 1:15 AM
Moonset: 12:16 AM
Moon Phase: Waning Gibbous
Moon Illumination: 55.7%

Best Times for Fishing or Hunting

Major Periods

12:45 AM - 3:15 AM
12:45 AM - 3:15 AM

Minor Periods

11:46 AM - 1:16 PM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Thursday, July 17, 2025

Weather Forecast

Conditions: Heavy rain
Average Temperature: 24.3°C
Average Humidity: 86%
Chance of Rain: 86%
Wind: 21.7 mph
UV Index: 2.3

Air Quality

AQI: 2 - Moderate
PM2.5: 16.75 μg/m3
PM10: 16.91 μg/m3
Carbon Monoxide: 386.06 μg/m3
Nitrogen Dioxide: 19.14 μg/m3
Sulphur Dioxide: 5.88 μg/m3
Ozone: 104.72 μg/m3

Astronomical

Sunrise: 5:54 AM
Sun Transit: 1:24 PM
Sunset: 8:55 PM
Daylight: 15 hrs 1 mins
Moonrise: 12:57 AM
Moon Transit: 6:36 AM
Moonset: 1:31 PM
Moon Phase: Last Quarter
Moon Illumination: 44.4%

Best Times for Fishing or Hunting

Major Periods

6:06 AM - 8:36 AM
7:57 PM - 10:27 PM

Minor Periods

1:01 PM - 2:31 PM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Friday, July 18, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 18.7°C
Average Humidity: 69%
Chance of Rain: 0%
Wind: 15.9 mph
UV Index: 2.5

Air Quality

AQI: 1 - Good
PM2.5: 6.08 μg/m3
PM10: 6.24 μg/m3
Carbon Monoxide: 443.33 μg/m3
Nitrogen Dioxide: 10.18 μg/m3
Sulphur Dioxide: 5.12 μg/m3
Ozone: 90.76 μg/m3

Astronomical

Sunrise: 5:55 AM
Sun Transit: 1:24 PM
Sunset: 8:54 PM
Daylight: 14 hrs 59 mins
Moonrise: 12:20 AM
Moon Transit: 7:26 AM
Moonset: 2:49 PM
Moon Phase: Last Quarter
Moon Illumination: 33.4%

Best Times for Fishing or Hunting

Major Periods

6:56 AM - 9:26 AM
8:49 PM - 11:19 PM

Minor Periods

2:19 PM - 3:49 PM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Saturday, July 19, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 20.5°C
Average Humidity: 58%
Chance of Rain: 0%
Wind: 7.4 mph
UV Index: 1.9

Air Quality

AQI: 2 - Moderate
PM2.5: 18.37 μg/m3
PM10: 18.68 μg/m3
Carbon Monoxide: 547.82 μg/m3
Nitrogen Dioxide: 26.79 μg/m3
Sulphur Dioxide: 8.56 μg/m3
Ozone: 104.36 μg/m3

Astronomical

Sunrise: 5:56 AM
Sun Transit: 1:24 PM
Sunset: 8:53 PM
Daylight: 14 hrs 57 mins
Moonrise: 12:47 AM
Moon Transit: 8:20 AM
Moonset: 4:09 PM
Moon Phase: Last Quarter
Moon Illumination: 23.2%

Best Times for Fishing or Hunting

Major Periods

7:50 AM - 10:20 AM
12:00 AM - 12:00 AM

Minor Periods

3:39 PM - 5:09 PM
12:17 AM - 1:47 AM

Action Rating: 2 out of 5

Sunday, July 20, 2025

Weather Forecast

Conditions: Patchy rain nearby
Average Temperature: 22.3°C
Average Humidity: 65%
Chance of Rain: 89%
Wind: 10.5 mph
UV Index: 0.1

Air Quality

AQI: 2 - Moderate
PM2.5: 17.58 μg/m3
PM10: 17.93 μg/m3
Carbon Monoxide: 555 μg/m3
Nitrogen Dioxide: 38.12 μg/m3
Sulphur Dioxide: 8.68 μg/m3
Ozone: 86.77 μg/m3

Astronomical

Sunrise: 5:57 AM
Sun Transit: 1:24 PM
Sunset: 8:52 PM
Daylight: 14 hrs 56 mins
Moonrise: 1:20 AM
Moon Transit: 9:18 AM
Moonset: 5:28 PM
Moon Phase: Waning Crescent
Moon Illumination: 14.4%

Best Times for Fishing or Hunting

Major Periods

8:48 AM - 11:18 AM
12:00 AM - 12:00 AM

Minor Periods

4:58 PM - 6:28 PM
12:50 AM - 2:20 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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