May in Troisdorf averages a daily high of 19.9°C with nights around 8.1°C. Expect roughly 12.6 wet days totalling 64.6mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Troisdorf is May–September.
Based on KOLN BONN, GM (6.3km), 1995–2024. 30 years of May data.