September in Hamden averages a daily high of 24.5°C with nights around 12.9°C. Expect roughly 9 wet days totalling 122.6mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Hamden is May–June.
Based on MOUNT CARMEL, CT US (1.4km), 1995–2024. 24 years of September data.