December in Bratsk averages a daily high of -13.2°C with nights around -20.1°C. Expect roughly 17.8 wet days totalling 21.5mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Bratsk is June–August.
Based on BRATSK, RS (18.4km), 1995–2024. 24 years of December data.