May in Mülheim averages a daily high of 18.3°C with nights around 9.3°C. Expect roughly 13.7 wet days totalling 73.4mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Mülheim is May–September.
Based on ESSEN BREDENEY, GM (6.8km), 1995–2024. 30 years of May data.