Environment Canada has issued a heat warning for Northwestern Ontario.

Daytime highs in the region over the next couple of days are expected to be in the high 20's to mid 30's, with humidex values reaching the mid-30's, with very little relief overnight as lows are expected to be in the high teens to low 20's.

A cold front will track across northwestern Ontario on Monday night or Tuesday morning which will bring a reprieve from the heat.

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

Residents are reminded to drink plenty of water, do their best to stay cool and check on older family, friends and neighbours to ensure they are staying safe.