Click on a day for an hourly weather forecast
The temperatures in Caldwell in September are comfortable with low of 14°C and and high up to 27°C.
The wather in Caldwell in September can vary between cold and nice weather days. Expect a few rainy days but usually not more than 3.
Our weather forecast can give you a great sense of what weather to expect in Caldwell in September 2025.
If you’re planning to visit Caldwell in the near future, we highly recommend that you review the 14 day weather forecast for Caldwell before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 4° / -3° | 6 | 22 | 3 | 37 mm | Awful | Caldwell in January |
| February | 7° / -1° | 5 | 22 | 1 | 23 mm | Ok | Caldwell in February |
| March | 12° / 2° | 6 | 25 | 0 | 32 mm | Ok | Caldwell in March |
| April | 16° / 5° | 4 | 26 | 0 | 22 mm | Good | Caldwell in April |
| May | 21° / 9° | 4 | 27 | 0 | 33 mm | Good | Caldwell in May |
| June | 27° / 14° | 3 | 27 | 0 | 18 mm | Perfect | Caldwell in June |
| July | 34° / 19° | 0 | 31 | 0 | 2 mm | Ok | Caldwell in July |
| August | 33° / 19° | 1 | 30 | 0 | 5 mm | Good | Caldwell in August |
| September | 27° / 14° | 2 | 28 | 0 | 11 mm | Perfect | Caldwell in September |
| October | 18° / 8° | 3 | 28 | 0 | 22 mm | Good | Caldwell in October |
| November | 9° / 1° | 4 | 25 | 1 | 28 mm | Ok | Caldwell in November |
| December | 3° / -3° | 9 | 19 | 4 | 47 mm | Awful | Caldwell in December |