April in Arnsberg averages a daily high of 14.8°C with nights around 2°C. Expect roughly 10.7 wet days totalling 45.2mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Arnsberg is May–September.
Based on ARNSBERG NEHEIM, GM (11.6km), 1995–2024. 19 years of April data.