Colorado weather in September
There's a real gradient across Colorado in September: 80° afternoons in Denver, 67° in Aspen, with snow in the mix at the cold end.
Based on 4 weather stations. Four stations from the Front Range to the high country — elevation is the whole story in Colorado, and about a mile of it separates these rows.
Front Range
Highs 77–80°, nights 48–49°, and 1.4–1.5 in of rain in a typical September.
| Place | Highs / lows | Wet days | Snow | The short version |
|---|---|---|---|---|
| Denver | 80° / 48° | 3 | 0.8 in | Warm afternoons, cold beer, and gold creeping down the mountains. |
| Colorado Springs | 77° / 49° | 3 | — | The rain shuts off and the whole month turns golden. |
The High Rockies
Highs near 67°, nights around 40°, and 1.9 in of rain in a typical September.
| Place | Highs / lows | Wet days | Snow | The short version |
|---|---|---|---|---|
| Aspen | 67° / 40° | 6 | 1.0 in | Gold everywhere, and the first dusting back on the peaks. |
Southwest Colorado
Highs near 77°, nights around 43°, and 2.0 in of rain in a typical September.
| Place | Highs / lows | Wet days | The short version |
|---|---|---|---|
| Durango | 77° / 43° | 4 | Gold on the mesas, and the wettest month of the year. |
Each place above has its own page for the full story — what the month feels like, what to pack, and whether the timing is right.