August in Biel/Bienne averages a daily high of 25°C with nights around 13.3°C. Expect roughly 11.6 wet days totalling 88.9mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Biel/Bienne is June–September.
Based on PAYERNE, SZ (42.1km), 1995–2024. 30 years of August data.