May in Roskilde averages a daily high of 15.1°C with nights around 8.9°C. Expect roughly 9.7 wet days totalling 36.4mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Roskilde is June–September.
Based on FALSTERBO, SW (54.9km), 1995–2024. 30 years of May data.