Caution is being urged amid heat warnings for the Chapleau and Gogama areas.
Environment Canada expects daytime temperatures in the low thirties, reaching the mid to high thirties with the humidex, with temperatures only dropping to the high teens overnight.
It's expected to cool down this weekend, but may stay in the upper twenties.
Public Health Sudbury and Districts warns the heat can cause issues - particularly for older adults, young children, pregnant women, people with chronic illnesses, and alcohol or drug users - emphasizing the need to drink plenty of liquids, stay in the shade, and take breaks from the heat.