May in Karlsruhe averages a daily high of 20.5°C with nights around 8.8°C. Expect roughly 12.9 wet days totalling 78.6mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Karlsruhe is May–September.
Based on RHEINSTETTEN, GM (6.7km), 1995–2024. 16 years of May data.