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Summit County (Breckenridge)
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United States weather

Weather in Summit County, Colorado for September 2026

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 2026, 2 snowy days are expected until the end of the month. The closest date with snow is Tuesday, September 29.

    • Temperatures

  • So far, September 2026 in Summit County is slightly warmer than the historical average by 1.1 °F.

  • The forecast for the coming days of September 2026 predicts a temperature of 13.3 °F , which is warmer than usual.

  • In general, the average temperature in Summit County at the beginning of September is 17.3 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 12.1 °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 183 mm.

    • More

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Average dry days
19
Dry days
Average rainy days
9
Rainy days
Average snowy days
3
Snow days
Average temperatures
14°/4°
Temperatures
Average wind speed
16 km/h
Avg max wind
Average humidity
56 %
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
Sunny
17°
3
Sunny
17°
4
Sunny
18°
5
Moderate or heavy snow showers
16°
6
Sunny
19°
7
Patchy rain possible
16°
8
Sunny
18°
9
Patchy rain possible
17°
10
Patchy light drizzle
17°
11
Patchy light rain with thunder
15°
12
Partly cloudy
15°
13
Sunny
15°
14
Sunny
14°
15
Moderate rain at times
15°
16
Light rain shower
15°
17
Moderate or heavy rain with thunder
11°
18
Sunny
13°
19
Sunny
14°
20
Partly cloudy
14°
21
Moderate or heavy rain shower
12°
22
Heavy snow
11°
23
Freezing fog
9°
24
Partly cloudy
11°
25
Sunny
14°
26
Sunny
15°
27
Thundery outbreaks possible
14°
28
Moderate or heavy rain shower
11°
29
Patchy rain possible
10°
30
Patchy rain possible
10°

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 Sunny
Sunny
 17° /4° 1.3 mm 0 cm
Sept. 3 Sunny
Sunny
 17° /4° 0.1 mm 0 cm
Sept. 4 Sunny
Sunny
 18° /5° 0.5 mm 0 cm
Sept. 5 Moderate or heavy snow showers
Moderate or heavy snow showers
 16° /4° 3.1 mm 0.5 cm
Sept. 6 Sunny
Sunny
 19° /4° 1.3 mm 0 cm
Sept. 7 Patchy rain possible
Patchy rain possible
 16° /5° 1.1 mm 0 cm
Sept. 8 Sunny
Sunny
 18° /4° 0 mm 0 cm
Sept. 9 Patchy rain possible
Patchy rain possible
 17° /4° 0.3 mm 0 cm
Sept. 10 Patchy light drizzle
Patchy light drizzle
 17° /4° 6.6 mm 0 cm
Sept. 11 Patchy light rain with thunder
Patchy light rain with thunder
 15° /4° 14 mm 0 cm
Sept. 12 Partly cloudy
Partly cloudy
 15° /4° 7.9 mm 0 cm
Sept. 13 Sunny
Sunny
 15° /3° 12.1 mm 2.1 cm
Sept. 14 Sunny
Sunny
 14° /3° 2.2 mm 1 cm
Sept. 15 Moderate rain at times
Moderate rain at times
 15° /3° 2 mm 0 cm
Sept. 16 Light rain shower
Light rain shower
 15° /4° 4 mm 0 cm
Sept. 17 Moderate or heavy rain with thunder
Moderate or heavy rain with thunder
 11° /3° 7.1 mm 0 cm
Sept. 18 Sunny
Sunny
 13° /2° 0.7 mm 0 cm
Sept. 19 Sunny
Sunny
 14° /2° 0.7 mm 0 cm
Sept. 20 Partly cloudy
Partly cloudy
 14° /4° 0 mm 0 cm
Sept. 21 Moderate or heavy rain shower
Moderate or heavy rain shower
 12° /1° 21.5 mm 12.2 cm
Sept. 22 Heavy snow
Heavy snow
 11° /1° 15.5 mm 10 cm
Sept. 23 Freezing fog
Freezing fog
 9° /1° 0.4 mm 0 cm
Sept. 24 Partly cloudy
Partly cloudy
 11° /0° 0.9 mm 0 cm
Sept. 25 Sunny
Sunny
 14° /3° 2.1 mm 0 cm
Sept. 26 Sunny
Sunny
 15° /3° 0.2 mm 0 cm
Sept. 27 Thundery outbreaks possible
Thundery outbreaks possible
 14° /4° 0.3 mm 0 cm
Sept. 28 Moderate or heavy rain shower
Moderate or heavy rain shower
 11° /4° 9.9 mm 0 cm
Sept. 29 Patchy rain possible
Patchy rain possible
 10° /1° 0.9 mm 0.1 cm
Sept. 30 Patchy rain possible
Patchy rain possible
 10° /2° 0.7 mm 0.1 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 14° and colder nights, dipping below 4°.

How much rainfall should be expected in Summit County during September?
Significant rainfall exceeding 183 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 2026?
Summit County experiences an average snowfall of 38.8 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 2026

Track daily snowfall levels and discover Summit County’s snowy potential this September ❄️
On average, Summit County sees 3 snowy days during September, with approximately 38.8 cm of total snowfall.

September rainfall patterns in Summit County

Explore the daily rainfall trends and prepare for Summit Countys September weather 💧
Typically, Summit County has 9 rainy days in September with a total of 183 mm of rainfall.
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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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