October in Biysk averages a daily high of 10°C with nights around -0.9°C. Expect roughly 13 wet days totalling 50.3mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Biysk is May–September.
Based on BIJSK ZONALNAJA, RS (23.2km), 1995–2024. 30 years of October data.