September in Vilnius averages a daily high of 18.2°C with nights around 8°C. Expect roughly 9.3 wet days totalling 62.7mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Vilnius is June–September.
Based on VILNIUS, LH (13.1km), 1995–2024. 26 years of September data.