September in Karlsruhe averages a daily high of 22.3°C with nights around 10.6°C. Expect roughly 9.4 wet days totalling 52mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Karlsruhe is May–September.
Based on RHEINSTETTEN, GM (6.7km), 1995–2024. 16 years of September data.