Click on a day for an hourly weather forecast
The temperatures in Fort Collins in September are comfortable with low of 12°C and and high up to 27°C.
The wather in Fort Collins 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 Fort Collins in September 2024.
If you’re planning to visit Fort Collins in the near future, we highly recommend that you review the 14 day weather forecast for Fort Collins before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 5° / -5° | 2 | 21 | 8 | 17 mm | Awful | Fort Collins in January |
| February | 5° / -6° | 3 | 14 | 12 | 31 mm | Awful | Fort Collins in February |
| March | 12° / 0° | 3 | 22 | 7 | 51 mm | Bad | Fort Collins in March |
| April | 16° / 3° | 3 | 21 | 6 | 61 mm | Ok | Fort Collins in April |
| May | 21° / 7° | 7 | 22 | 2 | 107 mm | Bad | Fort Collins in May |
| June | 29° / 13° | 3 | 27 | 0 | 43 mm | Good | Fort Collins in June |
| July | 32° / 16° | 3 | 28 | 0 | 47 mm | Good | Fort Collins in July |
| August | 31° / 15° | 2 | 29 | 0 | 28 mm | Good | Fort Collins in August |
| September | 27° / 12° | 2 | 28 | 0 | 31 mm | Perfect | Fort Collins in September |
| October | 18° / 5° | 2 | 26 | 3 | 30 mm | Ok | Fort Collins in October |
| November | 12° / 0° | 1 | 24 | 5 | 18 mm | Bad | Fort Collins in November |
| December | 5° / -5° | 3 | 20 | 8 | 15 mm | Awful | Fort Collins in December |