August in Bielefeld averages a daily high of 23.4°C with nights around 13.5°C. Expect roughly 13.2 wet days totalling 81mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Bielefeld is May–September.
Based on BAD SALZUFLEN, GM (17km), 1995–2024. 30 years of August data.