April in Ulm averages a daily high of 12.8°C with nights around 2°C. Expect roughly 12.8 wet days totalling 55.4mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Ulm is June–September.
Based on MERKLINGEN, GM (21km), 1995–2024. 30 years of April data.