June in Bonn averages a daily high of 22.7°C with nights around 11.9°C. Expect roughly 12.6 wet days totalling 80.7mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Bonn is May–September.
Based on BONN ROLEBER, GM (6.9km), 1995–2024. 24 years of June data.