Temperatures approaching 30 C degrees are expected for P.E.I. on Tuesday and will continue on Wednesday, according to the latest Environment Canada forecast.
Besides the heat and humidity, Environment Canada is also calling for "very high" UV levels which means a higher risk of sunburn.
"After a couple of days of being hot and living in a place that has no air conditioning, the heat just overwhelms the body's capacity to adapt".
He said the Montreal heat exposure victims were between 50 and 80.
The number of heat-related deaths in Montreal was pegged at six on Tuesday.
Toronto's Medical Officer of Health extended the city's heat warning until further notice over the weekend.
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Montreal health officials say 11 people have died since the intense heat set in over the weekend, with health authorities in the Eastern Townships region east of Montreal attributing another four deaths to the sweltering temperatures.
While this morning might have felt slightly cooler, daytime highs in the low thirties will continue for a few more days and with the humidex Torontonians should expect it to feel more like "mid to high thirties today, and near low forties for Wednesday and Thursday".
The move is part of the federal government's climate change adaptation in expectation of more frequent heat events.
All seven cooling centres in the city are open.
Isolated adults, seniors, young children, people experiencing homelessness and people with certain mental health illnesses, chronic illnesses, heart and lung issues or limited mobility are at greater risk of heat-related illnesses.
Dr. Stang says he doesn't fear having more frequent warnings will make people pay less attention to them. Friday is forecast to be 28 C with a 40 per cent chance of showers.