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It says overnight low temperatures are expected to range between 19 and 23 C, providing little relief from the heat. 

The heat wave is expected in all of southern Ontario along Lake Erie and Lake Ontario and across a stretch of Quebec to the Trois-Rivières area. 

It’s yet another heat warning for Ontario this summer, where last month temperature records in many parts of the province were broken during an extreme heat wave. 

During heat warnings, people are advised to drink water often, watch for signs of heat exhaustion and to check on older adults and those at risk of heat illness. 

This report by The Canadian Press was first published July 26, 2025.