A government heat warning is in place for the region, but meteorologists are forecasting a drop in temperatures at the end of the week.
He said the Montreal heat exposure victims were between 50 and 80.
Besides the heat and humidity, Environment Canada is also calling for "very high" UV levels which means a higher risk of sunburn.
The move is part of the federal government's climate change adaptation in expectation of more frequent heat events.
Another four deaths have been reported in the Eastern Townships region east of Montreal, with officials expected to provide an update Wednesday.
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Southern Ontario is under an extreme heat warning with humidex values skyrocketing to 43 degrees.
At least eight people in the US and Canada have died in the past week due to the intense heat wave affecting parts of North America.
While coastal areas can expect cooler conditions, overnight lows will struggle to fall between 18 or 19 C degrees.
All seven cooling centres in the city are open.
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.
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People at risk of heat-related illnesses include those with chronic illnesses, people with limited mobility or certain mental health illnesses, infants and young children, people on certain medications, and the homeless.
University of Waterloo climate scientist Blair Feltmate says the heat wave can't be directly attributed to climate change, but that suggesting the two aren't linked would be like arguing that no particular home run can be attributed to steroids when a baseball player on a hitting streak is caught doping.
A fifth fatality may also have been caused by the heat, they said.
Make sure to stay cool and hydrated.
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