July in Deventer averages a daily high of 22.9°C with nights around 12.4°C. Expect roughly 14.4 wet days totalling 86.4mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Deventer is May–September.
Based on HEINO, NL (20.9km), 1995–2024. 30 years of July data.