April in Biysk averages a daily high of 12°C with nights around -0.7°C. Expect roughly 10.4 wet days totalling 39.7mm. 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 April data.