Summit County (Park City)
September
Weather in Summit County for September 2025
Your guide to Summit County weather in September - trends and predictions
In general, the average temperature in Summit County at the beginning of September is 26.4 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 25.4 °F by the end of September.
Summit County experiences moderate rainfall in September, with an average of 8 rainy days and a total precipitation of 12.6 mm.
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Temperatures
Rain 🌧️
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22
Dry days
8
Rainy days
0
Snow days
23°/7°
Temperatures
19 km/h
Avg max wind
39 %
Avg humidity
Summit County Weather September
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| Sun. | Mon. | Tue. | Wed. | Thu. | Fri. | Sat. |
|---|---|---|---|---|---|---|
| 1  28° | 2  28° | 3  25° | 4 23° | 5 26° | 6 27° | |
| 7  28° | 8 27° | 9 26° | 10  26° | 11 25° | 12  14° | 13 19° |
| 14 23° | 15 23° | 16 21° | 17  11° | 18 16° | 19  19° | 20 21° |
| 21 20° | 22 20° | 23  19° | 24 24° | 25 26° | 26 25° | 27 26° |
| 28 28° | 29 27° | 30 22° |
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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 | UV | More |
|---|---|---|---|---|---|
| Sept. 1 | Sunny | 28° /11° | 0 mm | 7 | |
| Sept. 2 | Patchy rain possible | 28° /12° | 0.5 mm | 6 | |
| Sept. 3 | Thundery outbreaks possible | 25° /10° | 1.4 mm | 5 | |
| Sept. 4 | Patchy rain possible | 23° /9° | 0.1 mm | 5 | |
| Sept. 5 | Sunny | 26° /6° | 0 mm | 7 | |
| Sept. 6 | Sunny | 27° /9° | 0 mm | 7 | |
| Sept. 7 | Partly cloudy | 28° /10° | 0 mm | 7 | |
| Sept. 8 | Partly cloudy | 27° /12° | 0 mm | 7 | |
| Sept. 9 | Patchy rain possible | 26° /13° | 0.1 mm | 6 | |
| Sept. 10 | Patchy light drizzle | 26° /10° | 1.3 mm | 6 | |
| Sept. 11 | Sunny | 25° /10° | 0.8 mm | 7 | |
| Sept. 12 | Patchy light snow with thunder | 14° /4° | 2.2 mm | 3 | |
| Sept. 13 | Sunny | 19° /2° | 0 mm | 5 | |
| Sept. 14 | Sunny | 23° /6° | 0 mm | 6 | |
| Sept. 15 | Patchy light drizzle | 23° /9° | 0.8 mm | 5 | |
| Sept. 16 | Patchy light drizzle | 21° /7° | 1.4 mm | 5 | |
| Sept. 17 | Patchy light rain with thunder | 11° /7° | 4 mm | 3 | |
| Sept. 18 | Thundery outbreaks possible | 16° /4° | 0 mm | 4 | |
| Sept. 19 | Overcast | 19° /4° | 0 mm | 4 | |
| Sept. 20 | Partly cloudy | 21° /3° | 0 mm | 6 | |
| Sept. 21 | Thundery outbreaks possible | 20° /4° | 0 mm | 5 | |
| Sept. 22 | Sunny | 20° /3° | 0 mm | 6 | |
| Sept. 23 | Cloudy | 19° /5° | 0 mm | 4 | |
| Sept. 24 | Sunny | 24° /5° | 0 mm | 6 | |
| Sept. 25 | Sunny | 26° /5° | 0 mm | 7 | |
| Sept. 26 | Sunny | 25° /8° | 0 mm | 7 | |
| Sept. 27 | Sunny | 26° /8° | 0 mm | 7 | |
| Sept. 28 | Sunny | 28° /7° | 0 mm | 7 | |
| Sept. 29 | Sunny | 27° /10° | 0 mm | 7 | |
| Sept. 30 | Sunny | 22° /8° | 0 mm | 6 | |
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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?
Enjoy moderate daytime temperatures of up to 23° and cooler nights around 7°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Summit County during September?
Expect minimal rainfall in Summit County during September, with a total of 12.6 mm over approximately 8 days. This minimal precipitation is unlikely to significantly impact plans.
What are the typical wind conditions in Summit County during September?
The average wind speed in Summit County during September is 19 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Summit County
Explore the daily rainfall trends and prepare for Summit Countys September weather 💧
UV exposure in Summit County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Where is Summit County?Get accurate weather forecasts for Summit County, located at latitude 40.646 and longitude -111.498. Stay updated with localized weather information tailored for Summit County.
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