Events linked to climate change

As a result of ECCC’s investigation, human influence on the climate made the following heat waves at least two to 10 times more likely to occur:

Alberta (Aug. 25-31)

*denotes the average over the region

Peak, daily-high temperature during the heat wave: 28.8 C*

Degrees above normal, daily-high temperature: 9.3 C

Fort Smith, N.W.T. (Aug. 24-31)

Peak, daily-high temperature during the heat wave: 25.5 C*

Degrees above normal, daily-high temperature: 11.6 C

Summer heat/yokeetod/Getty Images-804324404-170667a

(Getty Images-804324404-170667a)

Southern British Columbia (Aug. 23 to Sept. 7)

Peak, daily-high temperature during the heat wave: 27.1 C*

Degrees above normal, daily-high temperature: 10.3 C

Northern British Columbia (Aug. 23 to Sept. 9)

Peak, daily-high temperature during the heat wave: 23.5 C*

Degrees above normal, daily-high temperature: 9.6 C

Southern Quebec (Aug. 7-13)

Peak, daily high temperature during the heat wave: 29.3 C*

Degrees above normal, daily-high temperature: 9.1 C

Northern Quebec (Aug. 6-9)

Peak, daily-high temperature during the heat wave: 23.8 C*

Degrees above normal, daily-high temperature: 7.0 C

Getty Images: Credit: LFO62 Creative #: 1147294367. Link: https://www.gettyimages.ca/detail/photo/womans-hand-and-the-sun-royalty-free-image/1147294367?adppopup=true

(Getty Images: Credit: LFO62 Creative #: 1147294367)

Fort Smith, N.W.T. (July 30 to Aug. 1)

Peak, daily-high temperature during the heat wave: 25.2 C*

Degrees above normal, daily-high temperature: 6.0 C

Atlantic Canada (July 10-15)

Peak, daily-high temperature during the heat wave: 25.6 C*

Degrees above normal, daily-high temperature: 7.1 C

Northern Quebec (July 10-13)

Peak, daily-high temperature during the heat wave: 24.2 C*

Degrees above normal, daily-high temperature: 7.5 C

Heat Wave, Ontario, Atlantic Canada, Summer, August, Heat, Jet Stream, August 06, 2025. (The Weather Network/Rachel Modestino)

A jet stream forecast for Eastern Canada during the weekend of Aug. 9-10, 2025. (The Weather Network)

As well, in August, a heat wave in Atlantic Canada was “far more likely” to happen due to climate change, with ECCC saying that particular event was “at least 10 times” more likely to occur as a result.