April in Viersen averages a daily high of 15.8°C with nights around 5.1°C. Expect roughly 11 wet days totalling 43.2mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Viersen is May–September.
Based on TONISVORST, GM (5.4km), 1995–2024. 30 years of April data.