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Some regions could see temperatures of up to 36 C as well as humidex values that could reach the 40s. 

The heat is expected to move into Montreal and other parts of Quebec on Wednesday and is forecast to last until Saturday. 

Environment Canada says extreme heat puts people at risk of exhaustion or heat stroke and poses a particular danger for vulnerable people.

The agency is asking people to check on older or at-risk people and to watch for early signs of heat exhaustion, which include headache, nausea, dizziness, thirst and intense fatigue.

This report by ºÃÉ«tvwas first published June 29, 2026.