Click on a day for an hourly weather forecast
The temperatures in Colorado in September are comfortable with low of 13°C and and high up to 25°C.
The wather in Colorado 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 Colorado in September 2025.
If you’re planning to visit Colorado in the near future, we highly recommend that you review the 14 day weather forecast for Colorado before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 4° / -6° | 4 | 18 | 9 | 24 mm | Awful | Colorado in January |
| February | 4° / -6° | 4 | 12 | 12 | 46 mm | Awful | Colorado in February |
| March | 10° / -1° | 4 | 19 | 8 | 70 mm | Bad | Colorado in March |
| April | 14° / 2° | 4 | 20 | 6 | 65 mm | Ok | Colorado in April |
| May | 19° / 7° | 8 | 21 | 2 | 99 mm | Bad | Colorado in May |
| June | 28° / 14° | 4 | 26 | 0 | 50 mm | Perfect | Colorado in June |
| July | 30° / 17° | 4 | 27 | 0 | 65 mm | Good | Colorado in July |
| August | 28° / 16° | 2 | 29 | 0 | 41 mm | Perfect | Colorado in August |
| September | 25° / 13° | 2 | 27 | 0 | 36 mm | Perfect | Colorado in September |
| October | 16° / 5° | 2 | 26 | 3 | 33 mm | Ok | Colorado in October |
| November | 11° / 0° | 2 | 23 | 5 | 24 mm | Bad | Colorado in November |
| December | 4° / -6° | 4 | 17 | 9 | 23 mm | Awful | Colorado in December |
For a more accurate weather forecast please select a city