August in Ulm averages a daily high of 22.4°C with nights around 11.2°C. Expect roughly 13.7 wet days totalling 84.4mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Ulm is June–September.
Based on MERKLINGEN, GM (21km), 1995–2024. 30 years of August data.