Yellowstone National Park (WY)
September
Weather in Yellowstone National Park, Wyoming for September 2027
Your guide to Yellowstone National Park weather in September - trends and predictions
Snowfall in Yellowstone National Park during September is quite rare, with fewer than 2 snowy days on average.
In general, the average temperature in Yellowstone National Park at the beginning of September is 19.9 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 16.3 °C 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 62.6 mm.
Is September a good time to visit Yellowstone National Park? check out the best time to travel to Yellowstone National Park page.
✨ Is September a good time to visit Yellowstone National Park? – Ask the AI Weatherman
Snow Forecast ❄️
Temperatures
Rain 🌧️
More
23
Dry days
6
Rainy days
1
Snow days
16°/5°
Temperatures
20 km/h
Avg max wind
51 %
Avg humidity
Yellowstone National Park Weather September
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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 in Yellowstone National Park day by day
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| Date | Weather | Temperatures | Rain | Snow | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 21° /8° | 0.9 mm | 0 cm | |
| Sept. 2 |  Patchy rain possible | 22° /7° | 0.1 mm | 0 cm | |
| Sept. 3 | Patchy rain possible | 18° /8° | 0.2 mm | 0 cm | |
| Sept. 4 | Sunny | 20° /7° | 0 mm | 0 cm | |
| Sept. 5 | Sunny | 20° /7° | 0 mm | 0 cm | |
| Sept. 6 | Sunny | 21° /6° | 0 mm | 0 cm | |
| Sept. 7 | Patchy rain possible | 18° /7° | 1.8 mm | 0 cm | |
| Sept. 8 | Sunny | 19° /4° | 0.2 mm | 0 cm | |
| Sept. 9 | Sunny | 18° /6° | 0 mm | 0 cm | |
| Sept. 10 |  Overcast | 20° /6° | 0 mm | 0 cm | |
| Sept. 11 |  Patchy light drizzle | 17° /7° | 1.4 mm | 0 cm | |
| Sept. 12 |  Moderate or heavy snow with thunder | 13° /3° | 5.4 mm | 1.9 cm | |
| Sept. 13 |  Moderate rain | 12° /4° | 19.6 mm | 0.1 cm | |
| Sept. 14 | Sunny | 13° /1° | 0.8 mm | 0 cm | |
| Sept. 15 | Patchy rain possible | 14° /3° | 0 mm | 0 cm | |
| Sept. 16 | Patchy rain possible | 15° /5° | 0.7 mm | 0 cm | |
| Sept. 17 | Light rain | 13° /5° | 3 mm | 0 cm | |
| Sept. 18 | Moderate rain | 12° /2° | 14.8 mm | 2.9 cm | |
| Sept. 19 | Light rain | 14° /5° | 3.5 mm | 0 cm | |
| Sept. 20 | Patchy rain possible | 14° /3° | 1.3 mm | 0 cm | |
| Sept. 21 | Patchy rain possible | 15° /5° | 1.5 mm | 0 cm | |
| Sept. 22 | Light rain | 12° /3° | 2.6 mm | 0 cm | |
| Sept. 23 | Patchy rain possible | 13° /3° | 1 mm | 0 cm | |
| Sept. 24 | Sunny | 17° /4° | 0 mm | 0 cm | |
| Sept. 25 | Sunny | 18° /5° | 0 mm | 0 cm | |
| Sept. 26 | Sunny | 16° /6° | 0 mm | 0 cm | |
| Sept. 27 | Sunny | 17° /3° | 0.4 mm | 0 cm | |
| Sept. 28 | Patchy rain possible | 17° /5° | 2.1 mm | 0 cm | |
| Sept. 29 |  Partly cloudy | 16° /4° | 0 mm | 0 cm | |
| Sept. 30 | Patchy rain possible | 12° /5° | 1.4 mm | 0 cm | |
| Next | |||||
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.
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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 16° 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 62.6 mm spread over approximately 6 days. Considering plans for rainy days is advisable.
Will it snow in Yellowstone National Park in September 2027?
Yellowstone National Park typically sees 4.9 cm of snowfall during September.
What are the typical wind conditions in Yellowstone National Park during September?
The average wind speed in Yellowstone National Park during September is 20 km/h, suggesting breezy to windy conditions, depending on your activities.
Yellowstone National Park snow forecast September 2027
Track daily snowfall levels and discover Yellowstone National Park’s snowy potential this September ❄️
On average, Yellowstone National Park sees 1 snowy days during September, with approximately 4.9 cm of total snowfall.
September rainfall patterns in Yellowstone National Park
Explore the daily rainfall trends and prepare for Yellowstone National Parks September weather 💧
Typically, Yellowstone National Park has 6 rainy days in September with a total of 62.6 mm of rainfall.
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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