"We are looking at temperatures 30 or above all the way until Friday".
Environment Canada advises that extreme heat affects everyone.
He said the Montreal heat exposure victims were between 50 and 80.
"The high heat and humidity could return on Wednesday", the heat warning reads.
A heat event for the Canada Day long weekend.More news: Gareth Southgate says England have 'brilliant opportunity' to end knockout hoodoo
"We would prefer having no deaths related to heat but with four days of intense heat and especially hot nights, we expect to see an impact on people's health", Kaiser said. "Humidex values will be in the mid to high thirties today, and near low forties for Wednesday and Thursday".
No deaths had been reported for the same period in the neighboring province of Ontario, which has also sizzled under extremely high temperatures. Cool down is expected by Friday with the passage of a cold front.
In response to the extended heat warning, the city has opened a number of cooling centres around Toronto.
Eleven people have died in the city as a result of the heat, according to a Quebec public health official. The risks are greater for young children, pregnant women, older adults, people with chronic illnesses and people working or exercising outdoors. Toronto is also providing transit tokens for people experiencing homelessness to get to cool places.
"We go out to the paramedics, we go out to the hospitals and we ask them to make sure to identify any deaths they believe are related to heat and that allows us to intervene more quickly", Kaiser said. Friday is forecast to be 28 C with a 40 per cent chance of showers. "And also keep in mind to make sure you don't leave any people or pets in your vehicle, as temperatures will rise dramatically within minutes".