April in Karlsruhe averages a daily high of 17°C with nights around 4.6°C. Expect roughly 9.9 wet days totalling 46.3mm. 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 April data.