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United States weather

Weather in Aspen, Colorado for September 2026

Your guide to Aspen weather in September - trends and predictions

    Snow Forecast ❄️

  • Snowfall in Aspen during September is quite rare, with fewer than 2 snowy days on average.
    According to Aspen snow forecast for September 2026, 1 snowy day is expected until the end of the month at Tuesday, September 29.

    • Temperatures

  • Until now, September 2026 in Aspen has been nearly identical to the historical average, with a temperature of 19.7 °F (showing only a slight deviation of 0.5 °F).

  • The forecast for the upcoming days in Aspen predicts a temperature of 14.5 °F, which is slightly above the historical average.

  • In general, the average temperature in Aspen at the beginning of September is 21.1 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 13.6 °F by the end of September.

    • Rain 🌧️

  • Aspen experiences moderate rainfall in September, with an average of 8 rainy days and a total precipitation of 138 mm.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
21
Dry days
Average rainy days
8
Rainy days
Average snowy days
1
Snow days
Average temperatures
18°/3°
Temperatures
Average wind speed
13 km/h
Avg max wind
Average humidity
51 %
Avg humidity

Aspen Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Sunny
22°
2
Sunny
21°
3
Sunny
21°
4
Sunny
21°
5
Patchy moderate snow
21°
6
Sunny
22°
7
Patchy rain possible
20°
8
Patchy rain possible
21°
9
Patchy rain possible
21°
10
Patchy rain possible
21°
11
Patchy light drizzle
20°
12
Partly cloudy
19°
13
Sunny
19°
14
Sunny
18°
15
Moderate or heavy rain with thunder
19°
16
Patchy light rain with thunder
19°
17
Moderate or heavy rain with thunder
14°
18
Sunny
16°
19
Sunny
18°
20
Sunny
18°
21
Thundery outbreaks possible
16°
22
Mist
16°
23
Thundery outbreaks possible
14°
24
Patchy rain possible
14°
25
Patchy rain possible
14°
26
Sunny
17°
27
Overcast
18°
28
Patchy rain possible
12°
29
Sunny
6°
30
Sunny
14°

Temperatures trend during September in Aspen

See the weather trend as well as the moving average line

September weather in Aspen day by day

Click on a date for more information
August October
Date Weather Temperatures Rain Snow More
Sept. 1 Sunny
Sunny
 22° /3° 0.4 mm 0 cm
Sept. 2 Sunny
Sunny
 21° /4° 0.3 mm 0 cm
Sept. 3 Sunny
Sunny
 21° /4° 0 mm 0 cm
Sept. 4 Sunny
Sunny
 21° /5° 0.2 mm 0 cm
Sept. 5 Patchy moderate snow
Patchy moderate snow
 21° /3° 0.2 mm 0.1 cm
Sept. 6 Sunny
Sunny
 22° /4° 1.3 mm 0 cm
Sept. 7 Patchy rain possible
Patchy rain possible
 20° /4° 0 mm 0 cm
Sept. 8 Patchy rain possible
Patchy rain possible
 21° /4° 0.1 mm 0 cm
Sept. 9 Patchy rain possible
Patchy rain possible
 21° /4° 0.2 mm 0 cm
Sept. 10 Patchy rain possible
Patchy rain possible
 21° /3° 2.6 mm 0 cm
Sept. 11 Patchy light drizzle
Patchy light drizzle
 20° /4° 12.1 mm 0 cm
Sept. 12 Partly cloudy
Partly cloudy
 19° /5° 5.2 mm 0 cm
Sept. 13 Sunny
Sunny
 19° /3° 4.9 mm 0 cm
Sept. 14 Sunny
Sunny
 18° /4° 4.1 mm 0 cm
Sept. 15 Moderate or heavy rain with thunder
Moderate or heavy rain with thunder
 19° /2° 2.8 mm 0 cm
Sept. 16 Patchy light rain with thunder
Patchy light rain with thunder
 19° /3° 1.1 mm 0 cm
Sept. 17 Moderate or heavy rain with thunder
Moderate or heavy rain with thunder
 14° /5° 14.5 mm 0 cm
Sept. 18 Sunny
Sunny
 16° /3° 0.8 mm 0 cm
Sept. 19 Sunny
Sunny
 18° /2° 1.2 mm 0 cm
Sept. 20 Sunny
Sunny
 18° /4° 5.3 mm 0 cm
Sept. 21 Thundery outbreaks possible
Thundery outbreaks possible
 16° /2° 15.5 mm 0 cm
Sept. 22 Mist
Mist
 16° /3° 7.9 mm 0.1 cm
Sept. 23 Thundery outbreaks possible
Thundery outbreaks possible
 14° /-1° 0.1 mm 0 cm
Sept. 24 Patchy rain possible
Patchy rain possible
 14° /5° 0.6 mm 0 cm
Sept. 25 Patchy rain possible
Patchy rain possible
 14° /3° 0.2 mm 0 cm
Sept. 26 Sunny
Sunny
 17° /3° 0 mm 0 cm
Sept. 27 Overcast
Overcast
 18° /5° 0.2 mm 0 cm
Sept. 28 Patchy rain possible
Patchy rain possible
 12° /4° 13 mm 0 cm
Sept. 29 Sunny
Sunny
 6° /0° 2.7 mm 1.3 cm
Sept. 30 Sunny
Sunny
 14° /0° 0 mm 0 cm
Next
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.
Change Month
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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 8 days. Preparing for wet conditions is recommended in your planning.

Will it snow in Aspen in September 2026?
Aspen typically sees 0.3 cm of snowfall during September.

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 1 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 8 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 ☀️

Quick links

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Location coordinates Where is Aspen?

Get accurate weather forecasts for Aspen, located at latitude 39.191 and longitude -106.818. Stay updated with localized weather information tailored for Aspen.

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