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Ontario, Quebec and large swaths of U.S. battle scorching temperatures

Ontario, Quebec and large swaths of U.S. battle scorching temperatures

CBC
Monday, June 23, 2025 05:35:37 PM UTC

Much of Ontario and southwestern Quebec are continuing to bake in high temperatures Monday as a heat dome lingers over the region.

Environment Canada issued a heat warning for the area on Saturday, saying hot and humid conditions will likely continue until Wednesday. Humidex values are expected to linger between 42 and 46 C, including in Toronto.

 

The dangerously high temperatures are expected to affect communities from southwestern Ontario and north to Sudbury and Timmins.

In Quebec, the hottest temperatures are expected to be felt from Montreal to Shawinigan and north to Abitibi.

Environment Canada meteorologist Julien Pellerin said he expects Ontario and Quebec to hit their peak daytime highs on Monday and Tuesday before the weather cools back down.

"It won't last very long," he added. "By the end of Tuesday and Wednesday, we will have a transition in air mass all over Canada, especially over Quebec and Ontario."

Heat levels in Ontario and Quebec led Environment Canada to remind people to stay hydrated by drinking water before they're thirsty, to watch for early signs of heat exhaustion and not overexert themselves.

"Be careful; you know yourself," Pellerin said. "Make sure you're aware of what you're feeling and take breaks. Make sure you have a location where you can rest with the air conditioning."

In Quebec, schools are being urged to stay vigilant with the rising temperatures.

In a letter from the assistant deputy education minister, schools were encouraged to "put in place all the preventive measures you judge necessary to ensure everyone's security."

"Depending on the situation, these measures could go all the way up to closing one or more schools for the day of June 23," said the message signed by Stephanie Vachon.

Pellerin says scorching temperatures over the eastern part of the continent are causing below-normal temperatures in other regions, which have led to warnings of wet snow and heavy rain in the West.

"If you have a heat dome on a sector, you can expect colder air in another sector, so that's what the Prairies are currently experiencing," Pellerin said on Sunday.

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