Heat warning issued for southern Ontario this weekend: Environment Canada

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TORONTO - Environment Canada has issued a heat warning for parts of southern Ontario this weekend, with humidex values expected to make it feel like 40 C.

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Hey there, time traveller!
This article was published 04/07/2025 (268 days ago), so information in it may no longer be current.

TORONTO – Environment Canada has issued a heat warning for parts of southern Ontario this weekend, with humidex values expected to make it feel like 40 C.

The alert issued Friday afternoon says daytime highs between 31 and 33 C can be expected on Saturday and Sunday.

It says overnight lows are projected to sit around 21 to 25 C, providing little relief from the heat.

People are silhouetted as they take in the sun along Lake Ontario in Toronto, on Tuesday, Sept. 5, 2023. THE CANADIAN PRESS/Spencer Colby
People are silhouetted as they take in the sun along Lake Ontario in Toronto, on Tuesday, Sept. 5, 2023. THE CANADIAN PRESS/Spencer Colby

The heat is expected to break Sunday night.

People are advised to drink water, limit direct exposure to the sun and plan outdoor activities during the coolest parts of the day.

This is the second heat warning issued for southern Ontario this summer, after extreme heat reaching the mid-30s broke temperature records in many parts of the province on June 22 and 23.

This report by The Canadian Press was first published July 4, 2025.

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