August in Biysk averages a daily high of 25.2°C with nights around 11.2°C. Expect roughly 10.7 wet days totalling 51.1mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Biysk is May–September.
Based on BIJSK ZONALNAJA, RS (23.2km), 1995–2024. 30 years of August data.