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Heat warning issued for the region Friday

Humidex values of 40 or higher possible
Hot Summer
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Heat warning in effect for:
    •    Newmarket - Georgina - Northern York Region
    •    Pickering - Oshawa - Southern Durham Region
    •    Uxbridge - Beaverton - Northern Durham Region
    •    Vaughan - Richmond Hill - Markham

Significant heat and humidity will arrive on Friday.

Daytime temperatures in the low to mid thirties with afternoon humidex values of 40 or higher and night time minimum temperatures in the low to mid twenties are expected for Friday and Saturday.

A cooler and less humid air mass is forecast to arrive in the wake of a weak cold front Sunday.

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.

Never leave people or pets inside a parked vehicle.

Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to or tweet reports using #ONStorm.