https://www.accuweather.com/en/ca/vancouver/v6c/august-weather/53286?year=2025 The last day to be at least 25 C in Vancouver will be by the end of August or possibly very early into September.
https://www.accuweather.com/en/ca/vancouver/v6c/september-weather/53286?year=2025 The last day to be at least 20 C in Vancouver could be during the 2nd or 3rd week.
https://www.accuweather.com/en/ca/montreal/h3a/september-weather/2-56186_1_al?year=2025 Montreal might have its last 20 C day right at the end of September.
https://www.accuweather.com/en/ca/toronto/m5h/october-weather/55488?year=2025 The last 20 C day in Toronto could be a week into October.
From mid September 2024 to mid April 2025 is how long it took for Vancouver to have its last 20 C day of the year to its first 20 C day of the year. That's a 7 month stretch without it even getting to 70 F.
Just like being one of the last cities to revive part of its streetcar system, Vancouver will be one of the last cities to really have a heatwave that lasts over a week. Indeed, its very tough for Vancouver to get to 35 C and even more rare to reach or exceed 40 C.
While Toronto is the most southern BIG city in Canada, Windsor is the most southern small city in Canada.
