Heat warning issued for southern Ontario this weekend: Environment Canada

Canadian Press

Published Jul 04, 2025 • 1 minute read

Beating the heat at the fountain at Nathan Phillips Square in Toronto on Friday July 12, 2024. Security doesn't like it, as walking in the water isn't allowed. But these out of town visitor didn't know that. Photo by Ernest Doroszuk /Ernest Doroszuk/Toronto Sun/Post

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.

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.

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