Environment Canada has issued a heat warning for the region.

The heat event is expected to start on Monday with maximum daytime temperatures between 29 and 30 C, with humidex values in the mid-thirties and overnight lows between 17 and 20 C.

A cold front is anticipated to bring cooler temperatures into the region Thursday.

The risks are greater for younger children, pregnant women, older adults, people with chronic illnesses, and people working or exercising outdoors.