Click on a day for an hourly weather forecast
The temperatures in Danbury in September are comfortable with low of 14°C and and high up to 24°C.
You can expect about 3 to 8 days of rain in Danbury during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Danbury in September 2025.
If you’re planning to visit Danbury in the near future, we highly recommend that you review the 14 day weather forecast for Danbury before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 1° / -5° | 5 | 17 | 9 | 48 mm | Awful | Danbury in January |
| February | 2° / -5° | 5 | 13 | 10 | 59 mm | Awful | Danbury in February |
| March | 7° / -1° | 7 | 17 | 7 | 65 mm | Awful | Danbury in March |
| April | 13° / 5° | 6 | 23 | 1 | 68 mm | Ok | Danbury in April |
| May | 20° / 10° | 6 | 25 | 0 | 81 mm | Good | Danbury in May |
| June | 25° / 15° | 6 | 24 | 0 | 90 mm | Perfect | Danbury in June |
| July | 28° / 18° | 7 | 24 | 0 | 113 mm | Good | Danbury in July |
| August | 28° / 18° | 6 | 26 | 0 | 98 mm | Perfect | Danbury in August |
| September | 24° / 14° | 4 | 26 | 0 | 69 mm | Perfect | Danbury in September |
| October | 17° / 9° | 5 | 26 | 0 | 70 mm | Good | Danbury in October |
| November | 10° / 3° | 4 | 24 | 2 | 51 mm | Bad | Danbury in November |
| December | 4° / -1° | 5 | 19 | 7 | 67 mm | Awful | Danbury in December |