May in Arnhem averages a daily high of 18.8°C with nights around 7.5°C. Expect roughly 12.8 wet days totalling 66.2mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Arnhem is May–September.
Based on DEELEN, NL (8.8km), 1995–2024. 30 years of May data.