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.
Temperatures
25° / 13°
Rainy Days
2
Snowy Days
0
Dry Days
27
Rainfall
36
mm
Sun Hours
11.8
Hrs
