July in Groningen averages a daily high of 22.6°C with nights around 12.1°C. Expect roughly 14.9 wet days totalling 85.5mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Groningen is May–September.
Based on EELDE, NL (10.7km), 1995–2024. 30 years of July data.