September in Jena averages a daily high of 21°C with nights around 10.1°C. Expect roughly 10.8 wet days totalling 54.3mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Jena is May–September.
Based on JENA STERNWARTE, GM (0.5km), 1995–2024. 30 years of September data.