Heat peaks Tuesday in Ottawa, feeling like 43 degrees Celsius
Temperatures soaring to 35°C with humidity making it feel closer to 43°C. Late-afternoon showers possible; relief expected by Thursday.
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Ottawa is bracing for the hottest day of a sweltering heat wave on July 15, with temperatures reaching 35°C and humidity making it feel closer to 43°C.
Environment Canada warns that hot and humid air could bring deteriorating air quality, with the Air Quality Health Index potentially approaching the high-risk category. A chance of showers is possible in the late afternoon, but little relief from overnight temperatures — lows around 20°C Tuesday and Wednesday nights.
Meteorologists say Tuesday will mark the peak of this heat event. The worst is expected to end either Wednesday or Thursday evening, depending on how quickly the warm air mass moves out of the province. Until then, stay hydrated and limit outdoor activity during peak heat hours.
The facts
When does the heat peak in Ottawa?
The heat peaks on Tuesday, July 15, 2026, with temperatures reaching 35°C and humidity making it feel closer to 43°C.
When will relief from the heat arrive?
Relief from the heat in Ottawa is expected by either Wednesday or Thursday evening, July 16 or 17, 2026, depending on how quickly the warm air mass moves out of the province.
What air quality risks does Environment Canada warn about?
Environment Canada warns that hot and humid air in Ottawa could bring deteriorating air quality, with the Air Quality Health Index potentially approaching the high-risk category.
How low will overnight temperatures drop?
Overnight lows in Ottawa will reach around 20°C on Tuesday and Wednesday nights, July 15 and 16, 2026.
