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That rain may turn into a full-out thunderstorm, so plan your outdoor activities accordingly.

Environment Canada warns this extreme heat event will continue though for most of the week, calling this streak the most significant heat event in the past few years.

"A cold front is going to come Thursday night, and that will drop our temperatures back to more normal ones, especially for this weekend", says Cheng.

High heat and humidity are to blame for the deaths of at least 17 people since Sunday in Quebec, according to Dr. David Kaiser of Montreal's Regional Public Health Department.

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.

Premila D'Sa is a breaking news reporter, working out of the Star's radio room in Toronto.

Meanwhile, public-health officials in Quebec's Eastern Townships report four deaths suspected of being caused by the heat; one victim was a senior citizen and three were adults suffering from chronic illnesses.

The record-high temperature pattern is expected to continued through Thursday, with heat indexes - the "feels like" temperature when accounting for humidity - reaching up to 110 degrees in some parts.

An extended heat warning issued by the city's medical officer of health on Sunday remains in effect. Friday is forecast to be 28 C with a 40 per cent chance of showers. Toronto is also providing transit tokens for people experiencing homelessness to get to cool places.

"All of the deaths that we have identified are in a context of no air conditioning and where the measured temperature when the paramedics arrive is very high".