July in Jena averages a daily high of 26°C with nights around 14°C. Expect roughly 12.8 wet days totalling 83mm. 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 July data.