August in Nijmegen averages a daily high of 24.1°C with nights around 12.8°C. Expect roughly 13.4 wet days totalling 77.5mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Nijmegen is May–September.
Based on KLEVE, GM (18.9km), 1995–2024. 30 years of August data.