Weather in Yellowstone National Park, Wyoming for September 2026
With an average of 3 snowy days, Yellowstone National Park usually enjoys a light touch of snow in September.
According to Yellowstone National Park snow forecast for September 2026, 2 snowy days are expected until the end of the month. The closest date with snow is Monday, September 28.Until now, September 2026 in Yellowstone National Park is slightly cooler than the historical average by 1.6 °F.
The forecast for the next days in Yellowstone National Park predicts temperatures to be around 13 °F, close to the historical average.
In general, the average temperature in Yellowstone National Park at the beginning of September is 20.1 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 12.4 °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 71 mm.
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Yellowstone National Park Weather September
Temperatures trend during September in Yellowstone National Park
September weather in Yellowstone National Park day by day
| Date | Weather | Temperatures | Rain | Snow | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 21° /7° | 0.9 mm | 0 cm | |
| Sept. 2 |  Patchy rain possible | 22° /7° | 0.1 mm | 0 cm | |
| Sept. 3 | Patchy rain possible | 19° /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° /5° | 0 mm | 0 cm | |
| Sept. 7 |  Partly cloudy | 18° /7° | 1.8 mm | 0 cm | |
| Sept. 8 | Sunny | 19° /4° | 0.2 mm | 0 cm | |
| Sept. 9 | Sunny | 19° /5° | 0 mm | 0 cm | |
| Sept. 10 |  Overcast | 20° /5° | 0 mm | 0 cm | |
| Sept. 11 |  Patchy light drizzle | 18° /6° | 1.4 mm | 0 cm | |
| Sept. 12 |  Moderate or heavy snow with thunder | 13° /3° | 5.4 mm | 1.9 cm | |
| Sept. 13 |  Moderate or heavy snow showers | 12° /4° | 19.6 mm | 0.1 cm | |
| Sept. 14 | Sunny | 14° /1° | 0.8 mm | 0 cm | |
| Sept. 15 | Patchy rain possible | 14° /3° | 0 mm | 0 cm | |
| Sept. 16 | Patchy rain possible | 16° /4° | 0.7 mm | 0 cm | |
| Sept. 17 | Light rain shower | 14° /5° | 3 mm | 0 cm | |
| Sept. 18 |  Moderate or heavy rain shower | 10° /0° | 20.5 mm | 4.3 cm | |
| Sept. 19 | Light rain shower | 8° /4° | 7.4 mm | 0 cm | |
| Sept. 20 | Patchy rain possible | 9° /5° | 2.5 mm | 0 cm | |
| Sept. 21 | Sunny | 16° /4° | 0 mm | 0 cm | |
| Sept. 22 | Overcast | 16° /5° | 0 mm | 0 cm | |
| Sept. 23 | Sunny | 18° /6° | 0 mm | 0 cm | |
| Sept. 24 | Sunny | 19° /7° | 0 mm | 0 cm | |
| Sept. 25 | Sunny | 19° /7° | 0 mm | 0 cm | |
| Sept. 26 | Patchy rain possible | 17° /3° | 0.1 mm | 0 cm | |
| Sept. 27 | Sunny | 8° /1° | 0 mm | 0 cm | |
| Sept. 28 | Patchy rain possible | 6° /0° | 1.9 mm | 0.6 cm | |
| Sept. 29 |  Light snow showers | 7° /-1° | 0.7 mm | 0.3 cm | |
| Sept. 30 | Sunny | 11° /-3° | 0 mm | 0 cm | |
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Yellowstone National Park in September - FAQ
What are the expected maximum and minimum temperatures in Yellowstone National Park during September?
How much rainfall should be expected in Yellowstone National Park during September?
Will it snow in Yellowstone National Park in September 2026?
What are the typical wind conditions in Yellowstone National Park during September?
Yellowstone National Park snow forecast September 2026
September rainfall patterns in Yellowstone National Park
UV exposure in Yellowstone National Park during 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.