May in Lünen averages a daily high of 19.2°C with nights around 7.9°C. Expect roughly 12.3 wet days totalling 52.3mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Lünen is May–September.
Based on LUDINGHAUSEN BROCHTRUP, GM (16.9km), 1995–2024. 20 years of May data.