September in Bielefeld averages a daily high of 19.4°C with nights around 10.5°C. Expect roughly 11.7 wet days totalling 68.5mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Bielefeld is May–September.
Based on BAD SALZUFLEN, GM (17km), 1995–2024. 30 years of September data.