Active Alerts Derland, ON

Heat Warning
Issued at Sat 11:35 AM Jul. 13
Issued by: Environment and Climate Change Canada

A heat event will begin today and persist into tomorrow.

Daytime highs are expected to be near 29 degrees Celsius with humidex values of 34 to 36. There will be little relief at night as minimum temperatures of 18 degrees Celsius are expected.

These hot conditions may persist into Monday.


Extreme heat can affect everyone’s health.

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

Recommended Action

Drink plenty of water regularly, even before you feel thirsty to decrease your risk of dehydration. Thirst is not a good indicator of dehydration.

Reduce your heat risk. Schedule outdoor activities during the coolest parts of the day.

Never leave people, particularly children, or pets inside a parked vehicle.