https://en.wikipedia.org/wiki/Yakutsk
There could only be a couple of days in the 2nd half of August that might still be at least 21 C or 70F.
https://www.accuweather.com/en/ru/yakutsk/290150/august-weather/290150
https://en.wikipedia.org/wiki/Yakutsk#Climate
https://www.accuweather.com/en/ru/yakutsk/290150/september-weather/290150?year=2026
Then by early October, the 24 hour freezing winter begins.
https://www.accuweather.com/en/ru/yakutsk/290150/october-weather/290150?year=2026
LIVING IN A CITY CAR IN −51°C https://www.youtube.com/watch?v=Jb7E-s_9sUs
How We Live at –64°C? in a Yakutsk Apartment https://www.youtube.com/watch?v=kmzz_xYtwzY