January in Iserlohn averages a daily high of 3.4°C with nights around -1.1°C. Expect roughly 18.6 wet days totalling 120.6mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Iserlohn is June–September.
Based on LUDENSCHEID, GM (14.9km), 1995–2024. 30 years of January data.