August in Iserlohn averages a daily high of 21.9°C with nights around 12.2°C. Expect roughly 14.4 wet days totalling 96.5mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Iserlohn is June–September.
Based on LUDENSCHEID, GM (14.9km), 1995–2024. 30 years of August data.