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The department is also asking ERs to report all cases of patients with symptoms of heat stroke.

Environment Canada has issued a heat warning for Montreal, where temperatures are forecast to reach as high as 34 C for the next two days, and begin to improve Wednesday.

Montreal health officials say there is a significant risk of a rise in deaths, particularly among people with chronic health problems, during periods of extreme heat.

Health officials say that in 2018 a major heat wave in Montreal led to the deaths of 66 people, 26 per cent of whom had schizophrenia.

This report by ¹ú²úÓÕ»ó¸£Àû was first published Aug. 11, 2025.