The number of heat-related deaths in Montreal was pegged at six on Tuesday.
None had air conditioning, he said.
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.
Montreal reached a high of 34 degrees on Wednesday, a peak that is expected to continue on Thursday, before cooling to 24 degrees on Friday.
Montreal city hall unveiled an "extreme heat" plan on Tuesday that includes distributing water to groups working with the homeless.
An emergency coordination centre has been activated to supervise those measures and Montreal Mayor Valerie Plante has called on Montrealers to show solidarity with at-risk people.
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"Usually in a normal situation we have 10 deaths per day, so we're not in an excess of mortality", Drouin said. Firefighters are knocking on doors in neighbourhoods with less greenery where temperatures can rise up to five degrees higher than the forecast high.
Elsewhere, in Missouri, the Kansas City Health Department confirmed the Jackson County Medical Examiner has been informed of a second possible heat-related death involving a man in his 80s following the death of a woman in her 40s towards the end of June. Temperatures in Canada's largest city have topped 30 degrees every day since Friday. Unless a family member decides to bring them a personal fan, they are left stuck in the same temperatures that could cause life-threatening situations.
Heat warnings have also been issued for much of Ontario, Nova Soctia and New Brunswick.
The heat wave has hit the Atlantic provinces too. Overnight low temperatures are expected to be in the low to mid twenties, except high teens in some rural areas, providing little or no relief from the heat.
"There are still two days left of particularly hot weather with particularly high humidex levels, " Genereux said.
Drouin said the victims were part of "the very vulnerable population, the elderly or people suffering from chronic or mental illnesses".