The risks are greater for young children, pregnant women, older adults, people with chronic illnesses and people working or exercising outdoors.
The oppressive weather has enveloped much of Central and Eastern Canada since the Canada Day long weekend. "We're inviting the population to be vigilant for the next two days - for themselves as well as those close to them".
"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.
Drouin said there have been thousands of home visits and that officials want to avoid the results of an extended heat period in 2010, when 106 people died in the Montreal area.
The weather agency has advised Islanders to drink plenty of water, even before feeling thirsty, and to stay in a cool place.
"It could save a life", Genereux said.
The sweltering heat reached a high of 33.6 C at 4 p.m. on the final day of June, with a humidex reading of 43.
"None of the people we've identified in the last four days had air conditioning at home", Kaiser noted.
The city has also extended hours at eight outdoor pools during the heat wave.
The City of Toronto continues to have seven cooling stations open across the city as well as public, air-conditioned spaces like libraries and community centres available so people can catch a break from the never ending heat wave.
He is asking residents to call a provincial health-consultation line in the event of minor health problems or to check in with friends or family so as to leave 911 lines free for real emergencies.