September in Smolensk averages a daily high of 16.6°C with nights around 7°C. Expect roughly 10.1 wet days totalling 58.1mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Smolensk is May–September.
Based on SMOLENSK, RS (3.3km), 1995–2024. 24 years of September data.