July in Gronau averages a daily high of 23.6°C with nights around 12°C. Expect roughly 14.3 wet days totalling 82.3mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Gronau is May–September.
Based on TWENTHE, NL (11.3km), 1995–2024. 30 years of July data.