July in Siegen averages a daily high of 24.7°C with nights around 11.6°C. Expect roughly 14.1 wet days totalling 81.6mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Siegen is May–September.
Based on DILLENBURG, GM (23.1km), 1995–2024. 27 years of July data.