Active AlertsGrey Nuns Park, ON

Heat Warning
Issued at Thu 2:25 PM Jun. 1
Issued by: Environment and Climate Change Canada
Recommended Action

Drink plenty of water even before you feel thirsty and stay in a cool place.

Never leave people or pets inside a parked vehicle.


Two-day heat event beginning today.

Maximum temperatures: 29 to 33 degrees Celsius.

Minimum temperatures: 17 to 20 degrees Celsius.

Today into Friday.

Daytime high temperatures are expected to be near 30 degrees Celsius today and Friday. Overnight temperatures are expected to be in the high teens, providing little relief from the heat. Cooler temperatures return on Saturday.

Hot and humid air can also bring deteriorating air quality and can result in the Air Quality Health Index approaching the high risk category.


Extreme heat affects everyone.

The risks are greater for young children, pregnant women, older adults, people with chronic illnesses and people working or exercising outdoors.

Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to or tweet reports using #ONStorm.