September in Manchester averages a daily high of 23.4°C with nights around 10.6°C. Expect roughly 8.6 wet days totalling 101.7mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Manchester is May–September.
Based on MASSABESIC LAKE, NH US (5.1km), 1995–2024. 29 years of September data.