September in Yakutsk averages a daily high of 11.7°C with nights around 1.3°C. Expect roughly 9 wet days totalling 28.6mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Yakutsk is June–August.
Based on JAKUTSK, RS (1.6km), 1995–2024. 30 years of September data.