October in Gießen averages a daily high of 14.4°C with nights around 6.1°C. Expect roughly 12.3 wet days totalling 47.9mm. 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 October data.