May in Kerpen averages a daily high of 19.6°C with nights around 8.2°C. Expect roughly 12.3 wet days totalling 57.8mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Kerpen is May–September.
Based on WEILERSWIST LOMMERSUM, GM (18.7km), 1995–2024. 29 years of May data.