September in Ahlen averages a daily high of 20.6°C with nights around 10.4°C. Expect roughly 11.4 wet days totalling 51.4mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Ahlen is May–September.
Based on WERL, GM (20.6km), 1995–2024. 20 years of September data.