Typical September weather
Aspen
Colorado · September
67° days
40° nights
about 6 rainy days · 12½ hours of daylight
What to pack
- Sweater
- Sunscreen
What September feels like
The aspens turn from the top down, and the closing stretch of the month is why people book a year ahead; Castle Creek Road and the Bells are the classic drives. Freezing nights come back this month, so mornings bite even when the afternoon is shirtsleeve weather.
Expect about 6 days with real rain — enough to notice, not enough to plan around.
The numbers
| Typical high | 67° |
|---|---|
| Typical low | 40° |
| Days with real rain | 6 |
| Total rain | 1.9 in |
| Snowfall | 1.0 in |
| Sunrise / sunset (mid-month) | 6:48 am / 7:15 pm |