Environment Canada said a prolonged period of hot weather is expected through the weekend into next week.
Daytime high temperatures in excess of 30 degrees Celsius, with humidex values in the high thirties to low forties, are expected for the foreseeable future. Overnight lows near 20 degrees Celsius are also expected through this period, providing little relief from the heat, it said.
Hot and humid air can also bring deteriorating air quality and can result in the Air Quality Health Index approaching the high risk category.
Extreme heat affects everyone. The risks are greater for young children, pregnant women, older adults, people with chronic illnesses and people working or exercising outdoors, said asking residents to watch for the effects of heat illness: swelling, rash, cramps, fainting, heat exhaustion, heat stroke and the worsening of some health conditions.
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