August in Gießen averages a daily high of 24.8°C with nights around 12.9°C. Expect roughly 11.6 wet days totalling 62.8mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Gießen is May–September.
Based on GIESSEN WETTENBERG, GM (2.3km), 1995–2024. 30 years of August data.