October in Jena averages a daily high of 15.5°C with nights around 6.6°C. Expect roughly 12 wet days totalling 42.7mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Jena is May–September.
Based on JENA STERNWARTE, GM (0.5km), 1995–2024. 30 years of October data.