Officials urged residents to keep themselves hydrated and remain in the shade, while Montreal opened pools and air conditioned spaces to the public.
Public health officials said the number of heat-related deaths has now jumped to 33.
"It could save a life", Genereux said.
Heat warnings were in effect across southern Quebec, Ontario and the Atlantic region of the country, but temperatures were expected to drop overnight.
"A lot of them have a chronic disease condition", said Dr. Mylene Drouin, head of the regional health authority.
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The death toll has climbed every day this week, with most of the victims between the ages of 50 to 80.
Prime Minister Justin Trudeau tweeted condolences to the relatives of the Quebec victims. Montreal's health department has reported 12, and five have been reported in the Eastern Townships.
Kaiser said one reason Quebec has been reporting so many deaths is because it's part of the province's extreme heat plan, where health officials work in tandem with first responders and emergency rooms to track down potential cases of heat-related illnesses and deaths.
No deaths had been reported for the same period in the neighbouring province of Ontario, which has also sizzled under extremely high temperatures. "The elderly, people with chronic diseases and people with mental health problems are more at risk". "Obviously when we get there and the person may have passed, they're very rarely already with family".
In the largest city of the province - Montreal doctors ambulance has received over the last few days, more than 1200 calls, which is 30% more than usual.