July in Heilbronn averages a daily high of 26.7°C with nights around 13.9°C. Expect roughly 13 wet days totalling 83.4mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Heilbronn is May–September.
Based on OBERSULM WILLSBACH, GM (9.7km), 1995–2024. 21 years of July data.