January in Arnsberg averages a daily high of 5.4°C with nights around -0.8°C. Expect roughly 17.2 wet days totalling 71.7mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Arnsberg is May–September.
Based on ARNSBERG NEHEIM, GM (11.6km), 1995–2024. 19 years of January data.