Stifling heat forecast in Ontario, Quebec, Atlantic provinces and parts of B.C.
A heat warning from Environment Canada remains in effect for all of southern Ontario, stretching north past Lake Huron and Georgian Bay and east through southern Quebec.
Expected daytime highs could reach 35 degrees Celsius in some parts, with the humidex at or near 40 C.
Hot conditions are also washing over Atlantic Canada, with most of New Brunswick, Nova Scotia, Prince Edward Island and parts of Newfoundland and Labrador also under a heat warning.
Daytime highs in the region are forecast to reach around 30 degrees, with New Brunswick expecting that humid conditions will make it feel like 42 C.
In British Columbia, heat warnings are also in place for most of Vancouver Island, the Sunshine Coast, as well as southern B.C's Fraser Canyon, South Thompson and South Okanagan areas.
Environment Canada recommends monitoring for signs of heat exhaustion, as well as drinking water in these conditions.
This report by The Canadian Press was first published Aug. 11, 2025.
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Support local journalists and the next generation of journalists. Daily puzzles including the New York Times Crossword. SUBSCRIBE TO UNLOCK MORE ARTICLES Subscribe now to read the latest news in your city and across Canada. Unlimited online access to articles from across Canada with one account. Get exclusive access to the Toronto Sun ePaper, an electronic replica of the print edition that you can share, download and comment on. Enjoy insights and behind-the-scenes analysis from our award-winning journalists. Support local journalists and the next generation of journalists. Daily puzzles including the New York Times Crossword. REGISTER / SIGN IN TO UNLOCK MORE ARTICLES Create an account or sign in to continue with your reading experience. Access articles from across Canada with one account. Share your thoughts and join the conversation in the comments. Enjoy additional articles per month. Get email updates from your favourite authors. THIS ARTICLE IS FREE TO READ REGISTER TO UNLOCK. Create an account or sign in to continue with your reading experience. Access articles from across Canada with one account Share your thoughts and join the conversation in the comments Enjoy additional articles per month Get email updates from your favourite authors Don't have an account? Create Account Around 51 daily heat records were broken across the country on Monday with many regions recording temperatures in the mid-30s, said Christy Climenhaga, a scientist with Environment Canada. 'When numerous (temperature) records are falling, that indicates that it is more of a notable heat event,' Climenhaga said in an interview Tuesday. Relief is coming first for southern British Columbia, where a multi-day heat wave is expected to end on Tuesday or Wednesday, as temperatures return to the seasonal mid-20s in many regions. Monday's temperatures broke or tied daily heat records in nine regions in the province, according to Environment Canada, six of which were located on Vancouver Island. That included the Victoria area, which saw temperatures reach 33.8 C, nearly two degrees warmer than the 31.9 C record set in 1990. Your noon-hour look at what's happening in Toronto and beyond. By signing up you consent to receive the above newsletter from Postmedia Network Inc. Please try again This advertisement has not loaded yet, but your article continues below. New heat records stretched as far north as Pemberton on the mainland, with the weather agency reporting temperatures of 37.4 C, beating the 1977 daily temperature record by a small fraction. Read More Hot conditions are expected to continue through Wednesday in southern Ontario, stretching north past Lake Huron and Georgian Bay and east through southern Quebec. Ontario saw 10 new daily heat records broken or tied yesterday in areas including Algonquin Park, Goderich, Parry Sound and Bancroft, Climenhaga said. 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Fredericton also surpassed a daily high of 35 C from 1893 by a tiny fraction. This advertisement has not loaded yet, but your article continues below. Monday's heat in some Newfoundland and Labrador regions even set new monthly extreme temperature records for August, according to Environment Canada. La Scie, N.L., set a new monthly high of 31.5 C yesterday, breaking a previous August heat record of 31 C set on Aug. 7, 1990. Similarly, the Labrador region of Mary's Harbour broke a monthly record from Aug. 6, 1990, by almost two degrees. RECOMMENDED VIDEO Amid the heat, an Agriculture Canada update shows Nova Scotia, eastern Newfoundland, southeastern New Brunswick and portions of Prince Edward Island shifting into moderate and severe drought conditions over the past month, with rainfall levels plummeting to 60% of normal levels in Halifax. Climenhaga said an atmospheric upper ridge has formed in the atmosphere over the East Coast, trapping the heat and preventing the rain from getting through. This advertisement has not loaded yet, but your article continues below. 'You get heat building under that ridge that will give you prolonged periods of hot and dry weather,' she said. In eastern Ontario, water conservation efforts are underway with rainfall down 40% and a citywide burn ban in place for Ottawa. Agriculture Canada reported that fully 71% of the country was classified as abnormally dry or as being in a moderate to extreme drought by the end of July. It only takes a couple days of hot and dry weather for wildfire risk to grow, Climenhaga said, and that extended periods of extreme heat can 'increase risk and volatility very quickly.' Data show this year's wildfire season is already the second worst on record. 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