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Summit County (Breckenridge)
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United States weather

Weather in Summit County, Colorado for September 2025

Your guide to Summit County weather in September - trends and predictions

    Snow Forecast ❄️

  • With an average of 3 snowy days, Summit County usually enjoys a light touch of snow in September.
    According to Summit County snow forecast for September 2025, no snow is expected until the end of the month.

    • Temperatures

  • Until now, September 2025 in Summit County is slightly cooler than the historical average by -1.1 °F.

  • Expect cooler weather in the next days in Summit County with the forecast suggesting a temperature of 13.6 °F, lower than the historical average.

  • In general, the average temperature in Summit County at the beginning of September is 16.6 °F. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 14 °F by the end of September.

    • Rain 🌧️

  • Summit County experiences moderate rainfall in September, with an average of 9 rainy days and a total precipitation of 150.8 mm.

    • More

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

Average dry days
18
Dry days
Average rainy days
9
Rainy days
Average snowy days
3
Snow days
Average temperatures
15°/3°
Temperatures
Average wind speed
16 km/h
Avg max wind
Average humidity
53 %
Avg humidity

Summit County Weather September

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

Temperatures trend during September in Summit County

See the weather trend as well as the moving average line

September weather in Summit County day by day

Click on a date for more information
August October
Date Weather Temperatures Rain Snow More
Sept. 1 Sunny
Sunny
 18° /4° 0 mm 0 cm
Sept. 2 Patchy light rain
Patchy light rain
 17° /5° 1.8 mm 0 cm
Sept. 3 Patchy rain possible
Patchy rain possible
 17° /5° 0.1 mm 0 cm
Sept. 4 Patchy light rain with thunder
Patchy light rain with thunder
 17° /5° 0.6 mm 0 cm
Sept. 5 Moderate or heavy snow showers
Moderate or heavy snow showers
 14° /3° 4 mm 0.7 cm
Sept. 6 Sunny
Sunny
 17° /3° 1.8 mm 0 cm
Sept. 7 Patchy rain possible
Patchy rain possible
 16° /4° 1.6 mm 0 cm
Sept. 8 Sunny
Sunny
 17° /4° 0 mm 0 cm
Sept. 9 Patchy rain possible
Patchy rain possible
 16° /5° 0.4 mm 0 cm
Sept. 10 Patchy light drizzle
Patchy light drizzle
 15° /5° 9.9 mm 0 cm
Sept. 11 Patchy light rain with thunder
Patchy light rain with thunder
 13° /4° 20.8 mm 0 cm
Sept. 12 Partly cloudy
Partly cloudy
 13° /4° 11.4 mm 0 cm
Sept. 13 Sunny
Sunny
 12° /2° 16.5 mm 3.2 cm
Sept. 14 Sunny
Sunny
 14° /1° 2 mm 1.4 cm
Sept. 15 Moderate rain at times
Moderate rain at times
 14° /2° 2.3 mm 0 cm
Sept. 16 Partly cloudy
Partly cloudy
 14° /5° 0 mm 0 cm
Sept. 17 Sunny
Sunny
 11° /3° 0 mm 0 cm
Sept. 18 Sunny
Sunny
 12° /1° 0 mm 0 cm
Sept. 19 Sunny
Sunny
 15° /3° 0 mm 0 cm
Sept. 20 Patchy rain possible
Patchy rain possible
 15° /2° 0.4 mm 0 cm
Sept. 21 Patchy rain possible
Patchy rain possible
 10° /2° 0.6 mm 0 cm
Sept. 22 Sunny
Sunny
 13° /0° 0 mm 0 cm
Sept. 23 Sunny
Sunny
 17° /1° 0 mm 0 cm
Sept. 24 Partly cloudy
Partly cloudy
 16° /4° 0 mm 0 cm
Sept. 25 Partly cloudy
Partly cloudy
 17° /2° 0 mm 0 cm
Sept. 26 Sunny
Sunny
 19° /4° 0 mm 0 cm
Sept. 27 Patchy rain possible
Patchy rain possible
 14° /2° 0.2 mm 0 cm
Sept. 28 Sunny
Sunny
 13° /-2° 0 mm 0 cm
Sept. 29 Sunny
Sunny
 4° /-5° 0 mm 0 cm
Sept. 30 Cloudy
Cloudy
 15° /6° 0 mm 0 cm
Next
Important Notice
Our weather forecast for Summit County 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 Summit County forecast closer to your planned date for the most up-to-date weather information.
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Summit County in September - FAQ

What are the expected maximum and minimum temperatures in Summit County during September?
Prepare for cooler days with highs just around 15° and colder nights, dipping below 3°.
How much rainfall should be expected in Summit County during September?
Significant rainfall exceeding 150.8 mm is expected in Summit County during September, occurring over more than 9 days. Preparing for wet conditions is recommended in your planning.
Will it snow in Summit County in September 2025?
Summit County experiences an average snowfall of 67.81 cm during September, occurring over 3 days.
What are the typical wind conditions in Summit County during September?
The average wind speed in Summit County during September is 16 km/h, suggesting breezy to windy conditions, depending on your activities.

Summit County snow forecast September 2025

Track daily snowfall levels and discover Summit County’s snowy potential this September ❄️

September rainfall patterns in Summit County

Explore the daily rainfall trends and prepare for Summit Countys September weather 💧
Top locations in Summit County
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AkronBreckenridgePark City
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Location coordinates Where is Summit County?

Get accurate weather forecasts for Summit County, located at latitude 39.482 and longitude -106.038. Stay updated with localized weather information tailored for Summit County.

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