May in Bratsk averages a daily high of 14.2°C with nights around 2.6°C. Expect roughly 11.1 wet days totalling 32.9mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Bratsk is June–August.
Based on BRATSK, RS (18.4km), 1995–2024. 24 years of May data.