Local authorities are taking initiatives to combat the heat, including opening swimming pools and air-conditioned areas to the public, distributing water and having first responders checking in on vulnerable citizens.
According to Canadian Weather's advisory, humidex values in southern Quebec will reach near 40 on Wednesday, but conditions will grow "even more uncomfortable" on Thursday, when humidex values reach 43.
The number of heat-related deaths in Montreal was pegged at six on Tuesday. "However the daytime highs are still expected near 30 and overnight lows in the high teens", Environment Canada said Monday.
Twelve deaths were reported in Montreal and five were reported in Eastern Townships.
Officials have also called on the public to check on their neighbors. He says the last extended heat wave that baked the area was about seven years ago.
Montreal firefighters and police have been rolling out its emergency response efforts looking for people who may be at risk of health complications during this extreme heat wave.
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The air temperature will be 30 or above until Friday when a cold front is forecast to pass through southern Ontario.
He said the Montreal heat exposure victims were between 50 and 80.
"Usually when we get heat events it only lasts two or four days", Ms. Hobelman said.
"The most recent one was back in 2011", says Cheng.
Extreme heat affects everyone, Environment Canada said. However, the risks are greater for young children, pregnant women, older adults, people with chronic illnesses and people working or exercising outdoors. "And also keep in mind to make sure you don't leave any people or pets in your auto, as temperatures will rise dramatically within minutes".