September in Friedrichshafen averages a daily high of 20.3°C with nights around 10.8°C. Expect roughly 10.9 wet days totalling 75.7mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Friedrichshafen is June–September.
Based on FRIEDRICHSHAFEN UNTERRADERACH, GM (4km), 1995–2024. 22 years of September data.