Officials across the province advised people to drink plenty of water and check in on neighbours or relatives and, if need be, get them to a place where air conditioning is available.
Five more people have died as a result of extreme heat and humidity in Montreal after a week of record-breaking temperatures, bringing the city total up to 33, public health officials said Saturday.
The heat wave began last Friday and the death toll has increased every day this week.
Montreal was the area of the province with the highest number of victims, the government said, with 28 people dying from heat-related complications. About it reports the Montreal Gazette, citing data from the press service of the Minister of health of the province.
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Numerous victims were men over the age of 50 living alone in private apartments and seniors' residences, according to Dr. David Kaiser with Montreal's public health department.
On Thursday, Environment Canada had forecast a maximum temperature of 35 C (95 F) but said the heat index would make it feel like 45 C.
Montreal Mayor Valerie Plante said along with police and firefighters, residents need to check on vulnerable neighbors. Signs of heat illness could include cramps and rashes, and among the people with the highest risk of suffering are generally older adults, young children, the homeless and people with chronic illnesses.
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.