Park County (Yellowstone National Park)
September
Weather in Park County for September 2025
Your guide to Park County weather in September - trends and predictions
With an average of 3 snowy days, Park County usually enjoys a light touch of snow in September.
In general, the average temperature in Park County at the beginning of September is 22.4 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 17.9 °F by the end of September.
Park County experiences moderate rainfall in September, with an average of 6 rainy days and a total precipitation of 68 mm.
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Snow Forecast ❄️
Temperatures
Rain 🌧️
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21
Dry days
6
Rainy days
3
Snow days
17°/5°
Temperatures
21 km/h
Avg max wind
48 %
Avg humidity
Park County Weather September
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| Sun. | Mon. | Tue. | Wed. | Thu. | Fri. | Sat. |
|---|---|---|---|---|---|---|
| 1  25° | 2  24° | 3 19° | 4  20° | 5 22° | 6 23° | |
| 7 24° | 8 24° | 9 21° | 10  21° | 11  19° | 12  6° | 13  9° |
| 14 15° | 15 19° | 16 18° | 17 13° | 18  4° | 19  13° | 20 14° |
| 21 15° | 22 14° | 23  13° | 24 19° | 25 20° | 26 18° | 27 19° |
| 28 21° | 29 19° | 30 9° |
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Temperatures trend during September in Park 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 | 25° /8° | 0 mm | 0 cm | |
| Sept. 2 | Patchy rain possible | 24° /8° | 0.3 mm | 0 cm | |
| Sept. 3 | Patchy rain possible | 19° /8° | 0.7 mm | 0 cm | |
| Sept. 4 | Partly cloudy | 20° /4° | 0 mm | 0 cm | |
| Sept. 5 | Sunny | 22° /5° | 0 mm | 0 cm | |
| Sept. 6 | Sunny | 23° /6° | 0 mm | 0 cm | |
| Sept. 7 | Partly cloudy | 24° /7° | 0 mm | 0 cm | |
| Sept. 8 | Patchy rain possible | 24° /7° | 0.5 mm | 0 cm | |
| Sept. 9 | Sunny | 21° /7° | 0.1 mm | 0 cm | |
| Sept. 10 | Overcast | 21° /6° | 0 mm | 0 cm | |
| Sept. 11 | Patchy light drizzle | 19° /7° | 2.2 mm | 0 cm | |
| Sept. 12 | Moderate or heavy snow with thunder | 6° /2° | 16.2 mm | 5.8 cm | |
| Sept. 13 | Moderate or heavy snow showers | 9° /2° | 0.8 mm | 0.3 cm | |
| Sept. 14 | Sunny | 15° /1° | 0 mm | 0 cm | |
| Sept. 15 | Patchy rain possible | 19° /3° | 0.1 mm | 0 cm | |
| Sept. 16 | Patchy rain possible | 18° /6° | 1.6 mm | 0 cm | |
| Sept. 17 | Light rain shower | 13° /3° | 4.7 mm | 0 cm | |
| Sept. 18 | Moderate or heavy rain shower | 4° /1° | 41.1 mm | 8.7 cm | |
| Sept. 19 | Mist | 13° /5° | 0 mm | 0 cm | |
| Sept. 20 | Partly cloudy | 14° /0° | 0 mm | 0 cm | |
| Sept. 21 | Partly cloudy | 15° /4° | 0 mm | 0 cm | |
| Sept. 22 | Sunny | 14° /0° | 0 mm | 0 cm | |
| Sept. 23 | Cloudy | 13° /5° | 0 mm | 0 cm | |
| Sept. 24 | Sunny | 19° /4° | 0 mm | 0 cm | |
| Sept. 25 | Sunny | 20° /6° | 0 mm | 0 cm | |
| Sept. 26 | Sunny | 18° /8° | 0 mm | 0 cm | |
| Sept. 27 | Sunny | 19° /4° | 0 mm | 0 cm | |
| Sept. 28 | Sunny | 21° /5° | 0 mm | 0 cm | |
| Sept. 29 | Partly cloudy | 19° /6° | 0 mm | 0 cm | |
| Sept. 30 | Overcast | 9° /3° | 0 mm | 0 cm | |
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Important Notice
Our weather forecast for Park 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 Park County forecast closer to your planned date for the most up-to-date weather information.
Park County in September - FAQ
What are the expected maximum and minimum temperatures in Park County during September?
Enjoy moderate daytime temperatures of up to 17° and cooler nights around 5°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Park County during September?
Moderate rainfall is anticipated in Park County during September, with a total of 68 mm spread over approximately 6 days. Considering plans for rainy days is advisable.
Will it snow in Park County in September 2025?
Park County experiences an average snowfall of 14.8 cm during September, occurring over 3 days.
What are the typical wind conditions in Park County during September?
The average wind speed in Park County during September is 21 km/h, suggesting breezy to windy conditions, depending on your activities.
Park County snow forecast September 2025
Track daily snowfall levels and discover Park County’s snowy potential this September ❄️
September rainfall patterns in Park County
Explore the daily rainfall trends and prepare for Park Countys September weather 💧
UV exposure in Park County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Where is Park County?Get accurate weather forecasts for Park County, located at latitude 44.428 and longitude -110.588. Stay updated with localized weather information tailored for Park County.
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