August in Willich averages a daily high of 24.5°C with nights around 13.7°C. Expect roughly 13.2 wet days totalling 75.2mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Willich is May–September.
Based on TONISVORST, GM (7.7km), 1995–2024. 30 years of August data.