March in Köln averages a daily high of 11.7°C with nights around 3.9°C. Expect roughly 13.8 wet days totalling 54.5mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Köln is May–September.
Based on KOLN STAMMHEIM, GM (6.7km), 1995–2024. 29 years of March data.