Published on June 24, 2025 at 0.58 a.m.
Monday has marked a summit in the heat wave that has been weighing on Quebec since Sunday, with temperatures worthy of the tropics.
In short:
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With ambient humidity, the temperatures felt have reached historical levels in several regions and heat records have been exceeded.
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Temperatures had to maintain uncomfortable levels during the night, in Montreal in particular, with a feeling of 35.
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The heat wave should last until the end of the day on Tuesday, after which temperatures will drop in most regions.
Heat difficult to bear
In the afternoon on Monday, Mercury climbed up to 34.9 ° C in Montreal, going to 0.1 ° C from the monthly record in June 35 ° C. The humidx index reached 45, a brand equaling a monthly record dating back to June 21, 1953. This is the hottest day of the year until now.
The heat was even more stuffy in Ottawa, where a feeling of 46.5 was recorded at the capital’s international airport, in this case shattering the monthly record of June 19, 1995 of 44.
Not far away, just south of the American border, in Plattsburgh, he made 37.8 ° C on Monday.
Air overloaded with humidity
The night will not allow a real respite: the minimum planned in Montreal is 26 ° C, with a humidx of 35, that is to say conditions comparable to those experienced in Miami.
An exceptional humidity rate makes this warm heat overwhelming. The dew points reach 25 ° C in places, a threshold rarely observed in Quebec. A well -installed ridge brings up the humidity of the Gulf of Mexico, plunging a large part of southern Quebec in a tropical atmosphere.
Heat warnings in force
Environment Canada has issued heat warnings for many regions, including the island of Montreal. Temperatures above 30 ° C per day and minimums above 20 ° C at night are expected until Tuesday, with humidx indices beyond 40.
