Heat and air quality warnings in effect for Toronto and southern Ontario

Heat warnings remain in effect across the Greater Toronto Area, and the extreme weather likely isn’t going anywhere any time soon. Scorching temperatures reached 36 C on Tuesday and Environment Canada says the prolonged heat will last until Thursday or Friday for areas near Lake Erie and Lake Ontario. On top of the brutal heat, [...]

Heat and air quality warnings in effect for Toronto and southern Ontario Posted July 14, 2026 8:34 pm. Heat warnings remain in effect across the Greater Toronto Area, and the extreme weather likely isn’t going anywhere any time soon. Scorching temperatures reached 36 C on Tuesday and Environment Canada says the prolonged heat will last until Thursday or Friday for areas near Lake Erie and Lake Ontario.

On top of the brutal heat, Southern Ontario is also under a yellow-level warning for poor air quality that will last all night and through Wednesday. The national weather agency says smoke from forest fires from northwestern Ontario is causing poor air quality. Seniors, pregnant people, young children and those with an existing illness or health condition are more likely to be impacted.

“As smoke levels increase, health risks increase,” Environment Canada says. “Limit time outdoors. Consider reducing or rescheduling outdoor sports, activities and events.”

Wednesday’s forecast calls for a mix of sun and cloud, and a 30 per cent chance of showers in the late afternoon in Toronto. Temperatures are expected to reach a high of 33 C with humidex values near 41 C.