Stifling heat forecast in Ontario, Quebec, Atlantic provinces and parts of B.C.
ONTARIO, CANADA, AUG 11 – Daytime highs may reach 35°C with humidex values near 40°C across multiple regions, prompting health advisories from Environment Canada, which urges caution amid dangerous heat conditions.
- On August 11, 2025, Environment Canada issued heat warnings for southern Ontario, parts of Quebec, Atlantic Canada, and southern British Columbia including Vancouver Island and the Sunshine Coast.
- These warnings followed prolonged hot and humid conditions, with humidex values near 40 degrees Celsius and some areas expecting daytime highs up to 35 degrees.
- New Brunswick faces particularly high humidity making it feel like 42 degrees Celsius, while Environment Canada advises monitoring for heat exhaustion and staying hydrated.
- Low-Income renters have called on governments for assistance to stay cool during the heat wave as many regions experience sustained high temperatures over 30 degrees Celsius.
- The heat warnings indicate ongoing health risks and the need for public caution across multiple provinces stretching from British Columbia to Atlantic Canada.
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35 Articles

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Stifling Heat Forecast in Ontario, Quebec, Atlantic Provinces and Parts of BC
Another day of punishing heat and humidity is expected to hit Ontario, Quebec and the four Atlantic provinces. 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 o…
Monday is expected to be hot and humid again in Quebec, Ontario and the four Atlantic provinces.
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