May in Nijmegen averages a daily high of 19.2°C with nights around 8.2°C. Expect roughly 13.4 wet days totalling 65.2mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Nijmegen is May–September.
Based on KLEVE, GM (18.9km), 1995–2024. 30 years of May data.