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Environment Canada warns of high heat and humidity for southern Quebec and Ontario

Forecasters say temperatures could reach 36 C and humidex values in the 40s, with yellow heat warnings issued for some Ontario communities.

  • According to the Weather Network, Ontario is experiencing its "first extreme heat event of the summer" as a heat dome south of the border drives temperatures across the province.
  • Temperatures are expected to stay above 32 C throughout the week, with Environment Canada warning of an extended period of hot and humid weather affecting southern regions.
  • The heat peaks during Canada Day celebrations and the FIFA World Cup final at Toronto Stadium, with humidex values forecast to "easily reach into the 40s," the Weather Network says.
  • Environment and Climate Change Canada recommends that people "check on family, friends and neighbours, who are at higher risk, particularly if they live alone, to make sure they have a cool space."
  • The heat spreads into Montreal and Quebec by Wednesday, lasting until Saturday, though relief is expected Sunday when highs drop to 28 C and overnight lows fall below 20 C.
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The Toronto StarThe Toronto Star
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Environment Canada warns of high heat and humidity for southern Quebec and Ontario

MONTREAL - Environment Canada is warning about an extended period of hot and humid weather forecast for southern Quebec and Ontario this week.

·Toronto, Canada
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  • 91% of the sources lean Left
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CTV News broke the news in Canada on Sunday, June 28, 2026.
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