September in Neuwied averages a daily high of 19°C with nights around 10.2°C. Expect roughly 11.4 wet days totalling 65mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Neuwied is June–September.
Based on HUMMERICH, GM (14.8km), 1995–2024. 21 years of September data.