Summit County (Breckenridge)
September
Weather in Summit County for September 2025
Your guide to Summit County weather in September - trends and predictions
With an average of 3 snowy days, Summit County usually enjoys a light touch of snow in September.
In general, the average temperature in Summit County at the beginning of September is 16.7 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 15.7 °F by the end of September.
Summit County experiences moderate rainfall in September, with an average of 9 rainy days and a total precipitation of 150.8 mm.
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Snow Forecast ❄️
Temperatures
Rain 🌧️
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18
Dry days
9
Rainy days
3
Snow days
15°/3°
Temperatures
16 km/h
Avg max wind
53 %
Avg humidity
Summit County in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  17° | 2  17° | 3  17° | 4  16° | 5  14° | 6 19° | 7 17° |
| 8 17° | 9 17° | 10 15° | 11 13° | 12  15° | 13 15° | 14 16° |
| 15  14° | 16 13° | 17  10° | 18 12° | 19 15° | 20 16° | 21 8° |
| 22  6° | 23  9° | 24 13° | 25 18° | 26 17° | 27  15° | 28 15° |
| 29 17° | 30  15° |
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Temperatures trend during September in Summit County
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | Snow | More |
|---|---|---|---|---|---|
| Sept. 1 | Sunny | 17° /5° | 0 mm | 0 cm | |
| Sept. 2 | Patchy light rain | 17° /4° | 3.7 mm | 0 cm | |
| Sept. 3 | Patchy rain possible | 17° /4° | 0.2 mm | 0 cm | |
| Sept. 4 | Patchy light rain with thunder | 16° /4° | 1.1 mm | 0 cm | |
| Sept. 5 | Moderate or heavy snow showers | 14° /1° | 3.2 mm | 1.4 cm | |
| Sept. 6 | Sunny | 19° /2° | 0.5 mm | 0 cm | |
| Sept. 7 | Patchy rain possible | 17° /4° | 3.1 mm | 0 cm | |
| Sept. 8 | Sunny | 17° /4° | 0 mm | 0 cm | |
| Sept. 9 | Patchy rain possible | 17° /4° | 0.8 mm | 0 cm | |
| Sept. 10 | Patchy light drizzle | 15° /3° | 2.2 mm | 0 cm | |
| Sept. 11 | Patchy light rain with thunder | 13° /3° | 1 mm | 0 cm | |
| Sept. 12 | Partly cloudy | 15° /2° | 0 mm | 0 cm | |
| Sept. 13 | Sunny | 15° /2° | 0 mm | 0 cm | |
| Sept. 14 | Sunny | 16° /2° | 0 mm | 0 cm | |
| Sept. 15 | Moderate rain at times | 14° /3° | 4.5 mm | 0.1 cm | |
| Sept. 16 | Light rain shower | 13° /3° | 3.5 mm | 0 cm | |
| Sept. 17 | Moderate or heavy rain with thunder | 10° /3° | 17.7 mm | 0 cm | |
| Sept. 18 | Sunny | 12° /1° | 0 mm | 0 cm | |
| Sept. 19 | Sunny | 15° /2° | 0 mm | 0 cm | |
| Sept. 20 | Partly cloudy | 16° /6° | 0 mm | 0 cm | |
| Sept. 21 | Moderate or heavy rain shower | 8° /0° | 64.5 mm | 36.7 cm | |
| Sept. 22 | Heavy snow | 6° /0° | 41 mm | 29.6 cm | |
| Sept. 23 | Freezing fog | 9° /0° | 0 mm | 0 cm | |
| Sept. 24 | Partly cloudy | 13° /2° | 0 mm | 0 cm | |
| Sept. 25 | Sunny | 18° /5° | 0 mm | 0 cm | |
| Sept. 26 | Sunny | 17° /7° | 0 mm | 0 cm | |
| Sept. 27 | Thundery outbreaks possible | 15° /7° | 0 mm | 0 cm | |
| Sept. 28 | Thundery outbreaks possible | 15° /7° | 3.6 mm | 0 cm | |
| Sept. 29 | Sunny | 17° /6° | 0 mm | 0 cm | |
| Sept. 30 | Cloudy | 15° /6° | 0 mm | 0 cm | |
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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.
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
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September rainfall patterns in Summit County
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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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