March in Bonn averages a daily high of 11°C with nights around 2.5°C. Expect roughly 14 wet days totalling 53.2mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Bonn is May–September.
Based on BONN ROLEBER, GM (6.9km), 1995–2024. 23 years of March data.