Toronto Heat Warning

• Heat warning issued for large part of Ontario, Quebec

  Daytime highs are expected to reach 35 C in parts of Ontario and Quebec, according to a heat warning from Environment Canada. Temperatures will cool mid-week, the agency says.

  Weather

  Aug 9, 2025
  
• Toronto, parts of southern Ontario under Labour Day heat warning

  The warning covers the entire Greater Toronto Area and goes beyond, including St. Catharines, Kitchener and Clarington, Ont. High temperatures are forecast to last into the week.

  Weather

  Sep 3, 2023
  
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• Cold front to bring relief following ‘extremely hot’ conditions Friday in much of southern Ontario

  A heat warning covers areas including Barrie, the GTA, Hamilton, the Niagara Region, London, south to Windsor. 

  Weather

  Jul 27, 2023
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• Hot, humid weather in Toronto prompts heat warning

  Environment Canada issued the warning on Wednesday, saying temperatures are expected to reach between 30 C and 33 C.

  Weather

  Jul 26, 2023
• ‘Multi-day’ heat wave alert issued for much of Ontario

  Environment Canada has issued a “multi-day” heat wave alert expected to continue until Thursday for most of Ontario, including the Greater Toronto Area.

  Weather

  Jul 4, 2023
• Majority of Ontario bracing for major heat event

  The warning said the temperatures would begin on Tuesday afternoon and could last for two to three days.

  Weather

  Jul 3, 2023
• ‘Stay in a cool place’: Heat warning issued for Toronto

  The weather agency said maximum tempertatures could reach 29 to 31 degrees. 

  Weather

  May 31, 2023
• Majority of southern Ontario under weekend warning for hot and humid weather

  Environment Canada issued a heat warning Saturday morning valid throughout the weekend, warning humidex values are expected to hit the low 40s.

  Weather

  Aug 6, 2022
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• Heat warnings continue for Toronto, parts of southern Ontario

  A warning updated at 11:15 a.m. for the City of Toronto said daytime temperatures would be in the low 30s, with humidex values approaching 40C both Saturday and Sunday.

  Environment

  Jul 23, 2022
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• Heat warning issued again for the Toronto area with ‘hot and humid conditions’ expected

  "Daytime high temperatures reaching the low thirties with humidex values in the upper thirties are expected Friday and Saturday."

  Weather

  Jul 21, 2022