Environment Canada has reissued a heat warning for Durham region, saying hot and humid conditions are expected through Monday.
Maximum daytime temperatures on Sunday will be 32 to 34 degrees Celsius with humidex values near 40. Minimum temperatures Sunday night will be 22 to 25 degrees Celsius, providing little relief from the heat, it said.
High temperatures Monday are forecast to be 30 to 32 degrees Celsius. Humidex values near 40 are also expected on Monday.
Cooler and less humid air is expected to arrive on Tuesday.
Hot and humid air can also bring deteriorating air quality and result in the air quality health index approaching the high risk category.
Extreme heat affects everyone.
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