The deaths were not concentrated in any specific municipality.
In addition to its cooling centres, there are many other places where people can go to escape the heat, the city said. Maritime temperatures are expected to return to seasonal normals for the weekend.
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.
Dr. Mylene Drouin, head of public health for the Montreal region, said the number of fatalities has risen since authorities first announced six deaths on Tuesday, but that the spike is not unexpected.
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In a short statement, he said on Instagram: "Thank you Northeast Ohio for an incredible four seasons". "This will always be home". The power forward shot 45.8% from the field, and served as a nice complement to the all-around playing style of LeBron James .
"This will be the most significant heat event in the past few years", according to Environment Canada.
Prime Minister Justin Trudeau tweeted condolences to the relatives of the Quebec victims.
In Ontario, a spokeswoman for the coroner's office said it couldn't confirm if there were any heat-related deaths, adding it could take weeks or several months to complete such probes.
Montreal city hall unveiled an "extreme heat" plan on Tuesday that includes distributing water to groups working with the homeless.
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A fifth fatality may also have been caused by the heat, they said.
Kaiser said people with underlying medical problems such as chronic diseases, diabetes, heart issues or mental health problems living in spaces with no air conditioning are the most vulnerable.
Montreal's civil services have announced the introduction of measures aimed at ensuring the well-being and safety of residents, including a door-to-door operation created to reach at-risk people and to provide prevention advice in certain areas.
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One possibility is for the 70-year-old CDU and CSU alliance to split which would rob Merkel of her parliamentary majority. Ahead of a hard Bavarian state election in October, the CSU is determined to show it is tough on migration.
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