https://dailyhive.com/vancouver/vancouver-august-forecast
Wow, there still might be about a dozen days that are at least 25 C. Most places won't even call anything a heatwave until its at least 30 C, some might even say 35 C.
https://www.accuweather.com/en/ca/vancouver/v6c/august-weather/53286
Unfortunatly, by September there might not even be 10 days reaching 20C. Usually, by the last week of September, that's it for Vancouver having any days at or above 21 C or 70 F until mid or late April.
https://www.accuweather.com/en/ca/vancouver/v6c/september-weather/53286?year=2025
By October, Vancouver is hard-pressed to even have one 20 C day.
https://www.accuweather.com/en/ca/vancouver/v6c/october-weather/53286?year=2025
It took until the 3rd week of April for Vancouver to have its first day of at least 20 C.
https://www.accuweather.com/en/ca/vancouver/v6c/april-weather/53286?year=2025
From late September to late April is 7 months without a 21 C or 70 F day in Vancouver.