Ottawa-Gatineau is generally in for one more day of dangerous heat before some relief arrives Friday, forecasters say.
The long-lasting heat warning has ended for the Maniwaki area, but remains in effect for the rest of the region Thursday.
In most areas the temperature and humidity will combine to make it feel like the mid to high 30s rather than the 40s.
Daytime highs range from 28 C in Maniwaki to 32 C in Ottawa and Cornwall.
Kingston and Belleville have generally been a bit cooler, but the dynamic flips overnight Thursday into Friday when residents will experience overnight lows around 21 C, plus humidity. Other areas should drop below 20 C for the first time in days.
Friday’s forecasted highs are around 27 C. The highest humidex value in the region that day is 35 in Kingston and Belleville.
Overnight lows in the mid to high teens are predicted Friday night, followed by more seasonal temperatures on the weekend.
Belleville and Kingston could experience thunderstorms and moderate air quality Thursday. Residents with respiratory problems may have to scale back outdoor activities.
Ottawa has also brought in an open-air fire ban.
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The heat dome brought the hottest temperatures of the year to some places and set daily records in others. Ottawa peaked at 33.7 C Wednesday with humidity making it feel like 44, a 2024 record.
Extreme heat can pose significant health risks to everyone, but certain groups are particularly vulnerable. These include older adults, infants and young children, pregnant people and those with physical or mental health conditions.
Ottawa Public Health has published an interactive map showing places to stay cool throughout the city, including pools, libraries, splash pads, fountains and community centres. Other health authorities and municipalities have shared similar guides.
During heat waves, people are advised to avoid outdoor exercise, take advantage of air conditioning and drink plenty of fluids.