Yellowstone National Park
September
Weather in Yellowstone National Park for September 2025
Your guide to Yellowstone National Park weather in September - trends and predictions
With an average of 3 snowy days, Yellowstone National Park usually enjoys a light touch of snow in September.
In general, the average temperature in Yellowstone National Park 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.
Yellowstone National Park 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
Yellowstone National Park 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 Yellowstone National Park
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 Yellowstone National Park 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 Yellowstone National Park forecast closer to your planned date for the most up-to-date weather information.
Yellowstone National Park in September - FAQ
What are the expected maximum and minimum temperatures in Yellowstone National Park 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 Yellowstone National Park during September?
Moderate rainfall is anticipated in Yellowstone National Park during September, with a total of 68 mm spread over approximately 6 days. Considering plans for rainy days is advisable.
Will it snow in Yellowstone National Park in September 2025?
Yellowstone National Park experiences an average snowfall of 14.8 cm during September, occurring over 3 days.
What are the typical wind conditions in Yellowstone National Park during September?
The average wind speed in Yellowstone National Park during September is 21 km/h, suggesting breezy to windy conditions, depending on your activities.
Yellowstone National Park snow forecast September 2025
Track daily snowfall levels and discover Yellowstone National Park’s snowy potential this September ❄️
September rainfall patterns in Yellowstone National Park
Explore the daily rainfall trends and prepare for Yellowstone National Parks September weather 💧
UV exposure in Yellowstone National Park during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Where is Yellowstone National Park?Get accurate weather forecasts for Yellowstone National Park, located at latitude 44.428 and longitude -110.588. Stay updated with localized weather information tailored for Yellowstone National Park.
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