August in Basel averages a daily high of 25.4°C with nights around 14.9°C. Expect roughly 12.3 wet days totalling 89.4mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Basel is June–September.
Based on BASEL BINNINGEN, SZ (2.9km), 1995–2024. 30 years of August data.