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Toronto to See First Heat Wave of the Summer as Orange Alert Issued. Here Is How Hot It Will Get

Environment and Climate Change Canada said the warning could bring major, widespread impacts as temperatures climb to 36 C and humidex values near 48 C.

  • Environment and Climate Change Canada issued a rare orange heat warning on Monday for Toronto and the GTA, characterizing the impact as "major, widespread" and warning it may last several days.
  • A warm front moved in overnight, ushering a very hot airmass and dangerously muggy conditions that triggered the extended heat wave. Environment Canada expects the heat to persist through Friday.
  • Meteorologists warn extreme heat is a leading weather-related cause of death globally, urging residents to stay hydrated and check on at-risk neighbors. Pearson International Airport's record high is 38.3 C from 1948.
  • On Canada Day, residents face conditions with a high of 36 C and humidex nearing 48, while Environment Canada warns that hot, humid air can deteriorate air quality.
  • Conditions should improve by early next week as humidity breaks and daytime highs fall back to the high 20s. The weather agency anticipates the excessive heat will subside following the weekend.
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26 Articles

The RecordThe Record
+13 Reposted by 13 other sources
Lean Left

Extreme, prolonged heat wave expected to cover much of Ontario

Environment Canada has issued orange and yellow weather warnings as an intense and prolonged heat wave is expected to blanket much of Ontario, including Toronto and Ottawa, starting today.

·Waterloo, Canada
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Winnipeg Free PressWinnipeg Free Press
+3 Reposted by 3 other sources
Center

Extreme, prolonged heat wave expected to cover much of southern Ontario

Environment Canada has issued an orange alert as an intense and prolonged heat wave is expected to blanket much of southern Ontario, including Toronto, starting today.

·Winnipeg, Canada
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City News broke the news in Toronto, Canada on Monday, June 29, 2026.
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