US EditionEnvironment Canada heat warnings remain in effect from Ontario to Newfoundland
SOUTHEASTERN CANADA AND NORTHWEST TERRITORIES, JUL 17 – Heat warnings cover a 2,400-kilometre area with highs of 31-34°C and humidex up to 42, prompting safety advisories for vulnerable populations, Environment Canada said.
- On July 17, 2025, Environment Canada issued heat warnings along a 2,400-kilometre stretch of southeastern Canada, first published July 17, 2025.
- Environment Canada forecast 31–34 degrees Celsius with humidex values of 37 to 42, prompting widespread heat warnings across southeastern Canada.
- Across southeastern Canada, from Windsor, Ontario, to St. John's, Newfoundland, daytime temperatures will remain hot longer, while the Hay River region sees highs of 28 to 31.
- Meanwhile, residents in Southern Ontario and southern Quebec will experience cooling later today or this evening, and wildfires, evacuations, and floods continue across Canada.
- A recent analysis by Climate Central found Toronto's average temperature has risen the most among all Major League Baseball cities over 40 seasons, indicating broader warming trends.
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Flin Flon Reminder
Toronto's average temperature rising fastest among Major League Baseball cities
A recent study has found that Toronto's average temperature has risen the most among all Major League Baseball cities during the season over the past 40 years.
Here’s how people and their furry friends are coping with the heat
Temperatures across Newfoundland and Labrador have been soaring this week with heat and fire bans in place. The CBC’s Madison Taylor took to the streets of St. John’s to find out how people are beating the heat.
In Quebec, heat warnings are mixed with severe thunderstorms.
Some regions of southeastern Canada are no longer subject to a heat warning on Thursday, but much of the country will continue to experience heat temperatures. In Quebec, heat warnings are mixed with severe thunderstorms.
Heat Warnings Remain in Effect From Ontario to Newfoundland: Environment Canada
Daytime temperatures from Windsor, Ontario, to St. John’s, Newfoundland, are going to remain hot a little longer. Environment Canada has several heat warnings in effect this morning, along a 2,400-kilometre stretch of southeastern Canada. The warnings forecast daytime highs in some areas between 31 and 34 degrees Celsius—with a humidex of 37 to 42. As with any heat warning, it is recommended that people watch for the early signs of heat exhausti…
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