Aspen (CO)
September
Weather in Aspen, Colorado for September 2026
Your guide to Aspen weather in September - trends and predictions
With an average of 2 snowy days, Aspen usually enjoys a light touch of snow in September.
In general, the average temperature in Aspen at the beginning of September is 21.3 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 17.7 °C by the end of September.
The climate of Aspen in September is notably wet, with an average of 12 rainy days, and a total of 138 mm of precipitation.
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Snow Forecast ❄️
Temperatures
Rain 🌧️
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16
Dry days
12
Rainy days
2
Snow days
18°/3°
Temperatures
13 km/h
Avg max wind
51 %
Avg humidity
Aspen Weather September
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Temperatures trend during September in Aspen
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September weather in Aspen day by day
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| Date | Weather | Temperatures | Rain | Snow | More |
|---|---|---|---|---|---|
| Sept. 1 |  Patchy rain possible | 23° /3° | 0 mm | 0 cm | |
| Sept. 2 |  Patchy light drizzle | 22° /4° | 0.4 mm | 0 cm | |
| Sept. 3 | Patchy rain possible | 22° /4° | 0 mm | 0 cm | |
| Sept. 4 | Patchy light drizzle | 21° /4° | 0.3 mm | 0 cm | |
| Sept. 5 |  Patchy moderate snow | 20° /2° | 0.3 mm | 0.1 cm | |
| Sept. 6 |  Sunny | 21° /3° | 1.9 mm | 0 cm | |
| Sept. 7 | Patchy rain possible | 20° /2° | 0 mm | 0 cm | |
| Sept. 8 | Patchy rain possible | 21° /3° | 0.1 mm | 0 cm | |
| Sept. 9 | Patchy rain possible | 21° /3° | 0.3 mm | 0 cm | |
| Sept. 10 | Patchy rain possible | 21° /3° | 3.9 mm | 0 cm | |
| Sept. 11 | Patchy light drizzle | 18° /3° | 18 mm | 0 cm | |
| Sept. 12 |  Partly cloudy | 18° /4° | 7.4 mm | 0 cm | |
| Sept. 13 | Sunny | 17° /2° | 5.3 mm | 0 cm | |
| Sept. 14 | Sunny | 18° /2° | 1.3 mm | 0 cm | |
| Sept. 15 |  Moderate or heavy rain with thunder | 18° /1° | 3.9 mm | 0 cm | |
| Sept. 16 |  Patchy light rain with thunder | 18° /1° | 0.8 mm | 0 cm | |
| Sept. 17 | Moderate or heavy rain with thunder | 14° /3° | 17.2 mm | 0 cm | |
| Sept. 18 | Sunny | 15° /1° | 0 mm | 0 cm | |
| Sept. 19 | Sunny | 19° /1° | 0 mm | 0 cm | |
| Sept. 20 | Sunny | 18° /5° | 7.9 mm | 0 cm | |
| Sept. 21 |  Thundery outbreaks possible | 16° /2° | 23.2 mm | 0 cm | |
| Sept. 22 |  Mist | 14° /3° | 11.2 mm | 0.1 cm | |
| Sept. 23 | Thundery outbreaks possible | 13° /-4° | 0 mm | 0 cm | |
| Sept. 24 | Sunny | 17° /1° | 0 mm | 0 cm | |
| Sept. 25 | Sunny | 20° /1° | 0 mm | 0 cm | |
| Sept. 26 | Sunny | 18° /3° | 0 mm | 0 cm | |
| Sept. 27 |  Cloudy | 18° /4° | 0 mm | 0 cm | |
| Sept. 28 | Thundery outbreaks possible | 17° /5° | 24 mm | 0 cm | |
| Sept. 29 | Sunny | 16° /5° | 10.4 mm | 0 cm | |
| Sept. 30 | Sunny | 18° /3° | 0 mm | 0 cm | |
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Important Notice
Our weather forecast for Aspen in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Aspen forecast closer to your planned date for the most up-to-date weather information.
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Aspen in September - FAQ
What are the expected maximum and minimum temperatures in Aspen during September?
During September, expect a variety of temperatures with highs around 18° and lows near 3°, suitable for diverse activities and preferences.
How much rainfall should be expected in Aspen during September?
Significant rainfall exceeding 138 mm is expected in Aspen during September, occurring over more than 12 days. Preparing for wet conditions is recommended in your planning.
Will it snow in Aspen in September 2026?
Aspen experiences an average snowfall of 0.335 cm during September, occurring over 2 days.
What are the typical wind conditions in Aspen during September?
The average wind speed in Aspen during September is 13 km/h, suggesting breezy to windy conditions, depending on your activities.
Aspen snow forecast September 2026
Track daily snowfall levels and discover Aspen’s snowy potential this September ❄️
On average, Aspen sees 2 snowy days during September, with approximately 0.3 cm of total snowfall.
September rainfall patterns in Aspen
Explore the daily rainfall trends and prepare for Aspens September weather 💧
Typically, Aspen has 12 rainy days in September with a total of 138 mm of rainfall.
UV exposure in Aspen during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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