There is a hot weather warning for Montreal and the Montérégie until Tuesday evening. The humidex could reach 40.
Experts say if you don't have to go outside during extreme heat, stay indoors.
“Avoid being in the heat as much as possible,” Dr. Mitch Shulman, CJAD's medical expert said.
If you don't have air conditioning at home, take refuge in air conditioned malls, movie theatres or libraries, for one to two hours at a time.
“Studies have shown that if you could get just an hour or two in air conditioning it could make a huge difference,” Dr. Mitch Shulman, said.
He says make sure you stay hydrated by drinking water before you're thirsty.
“If you’re drinking enough your urine should get clearer and clearer and clearer, so that it’s almost transparent, barely yellow at all, that tells you, that you’ve been drinking enough to meet your needs for the day.”
Dr. Mitch says the elderly, children and people with health problems need to be more careful and take it easy.