August in Heilbronn averages a daily high of 25.8°C with nights around 13.5°C. Expect roughly 12 wet days totalling 75.9mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Heilbronn is May–September.
Based on OBERSULM WILLSBACH, GM (9.7km), 1995–2024. 21 years of August data.