July in Gießen averages a daily high of 25°C with nights around 13°C. Expect roughly 12.9 wet days totalling 73.5mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Gießen is May–September.
Based on GIESSEN WETTENBERG, GM (2.3km), 1995–2024. 30 years of July data.