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Extreme Heat Wave in Ontario Continues for Canada Day
Environment Canada says southern Ontario could feel like 42 C, with overnight lows above 20 C and warnings stretching through Friday.
On Wednesday, July 1, 2026, Ontario residents are marking Canada Day under orange-level heat warnings as Environment Canada expects hot, humid conditions to persist through Friday across the province.
Orange heat warnings blanket the province from Windsor to Toronto and Ottawa, while northern regions including Sault Ste Marie and Thunder Bay face yellow-level warnings with humidex values near 40.
Dr. Nicola Mercer, CEO at Wellington-Dufferin-Guelph Public Health, urges residents to "check in regularly with family, friends and neighbours," while London has repurposed community centres as cooling stations.
Kitchener resident Andrew Ing cancelled his usual backyard fire, saying "Probably not a fire this week. Probably going to get out in the water," while Nishtha Tomer prioritizes staying hydrated.
Environment Canada meteorologist Peter Kimbell warns overnight lows will stay above 20 C, providing little relief, though current temperatures remain below the historic 1936 heat wave that lasted two weeks at 42 C.