August in Arnsberg averages a daily high of 23.5°C with nights around 10.9°C. Expect roughly 14.6 wet days totalling 94.5mm. 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 August data.