April in Iserlohn averages a daily high of 13°C with nights around 3.7°C. Expect roughly 12.2 wet days totalling 61mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Iserlohn is June–September.
Based on LUDENSCHEID, GM (14.9km), 1995–2024. 30 years of April data.