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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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41 Articles

NarcityNarcity
+12 Reposted by 12 other sources
Center

Extreme, prolonged heat wave expected to cover much of Ontario, parts of Quebec

A blast of dangerous heat has settled over Ontario and southern Quebec, with the extreme temperatures expected to linger for several days as tens of thousands of people are set to gather for Canada Day and World Cup festivities. Environment Canada warns the hot and humid conditions could last through the weekend in some areas.  "I'm a little bit uncomfortable confidently predicting an end to the heat wave because it looks like we could see heat …

·Canada
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TVA NouvellesTVA Nouvelles
Reposted by
Le Journal de QuebecLe Journal de Quebec
Lean Left

The heat wave on Quebec is likely to mulch as the first heat wave of the season with mercury that could reach 33°C.

·Montreal, Canada
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The Toronto StarThe Toronto Star
+16 Reposted by 16 other sources
Lean Left

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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CTV News broke the news in Canada on Sunday, June 28, 2026.
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