September in Danbury averages a daily high of 24°C with nights around 12.5°C. Expect roughly 9.3 wet days totalling 138.6mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Danbury is May–June.
Based on DANBURY, CT US (2.8km), 1995–2024. 26 years of September data.