April in Troisdorf averages a daily high of 16°C with nights around 4.4°C. Expect roughly 11.3 wet days totalling 48.9mm. 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 April data.