Click on a day for an hourly weather forecast
The temperatures in Cheyenne in September are comfortable with low of 12°C and and high up to 24°C.
The wather in Cheyenne 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 Cheyenne in September 2025.
If you’re planning to visit Cheyenne in the near future, we highly recommend that you review the 14 day weather forecast for Cheyenne before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 3° / -5° | 3 | 16 | 12 | 27 mm | Awful | Cheyenne in January |
| February | 2° / -6° | 4 | 10 | 15 | 42 mm | Awful | Cheyenne in February |
| March | 8° / -1° | 5 | 15 | 12 | 77 mm | Bad | Cheyenne in March |
| April | 12° / 1° | 5 | 15 | 10 | 101 mm | Bad | Cheyenne in April |
| May | 17° / 6° | 10 | 16 | 5 | 149 mm | Bad | Cheyenne in May |
| June | 25° / 12° | 6 | 24 | 0 | 77 mm | Perfect | Cheyenne in June |
| July | 28° / 16° | 4 | 27 | 0 | 83 mm | Perfect | Cheyenne in July |
| August | 28° / 15° | 3 | 28 | 0 | 52 mm | Perfect | Cheyenne in August |
| September | 24° / 12° | 2 | 28 | 0 | 46 mm | Perfect | Cheyenne in September |
| October | 14° / 4° | 3 | 23 | 5 | 49 mm | Ok | Cheyenne in October |
| November | 8° / -1° | 2 | 19 | 9 | 31 mm | Bad | Cheyenne in November |
| December | 2° / -6° | 5 | 15 | 11 | 33 mm | Awful | Cheyenne in December |