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Yellowstone National Park (WY)
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Yellowstone National Park (WY)
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Weather in Yellowstone National Park, Wyoming for September 2025

Your guide to Yellowstone National Park weather in September - trends and predictions

    Official Weather Alert ⚠️

  • Freeze Warning - See hour by hour.

    • Snow Forecast ❄️

  • 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 2025, 3 snowy days are expected until the end of the month. The closest date with snow is Saturday, September 27.

    • Temperatures

  • Until now, September 2025 in Yellowstone National Park is slightly cooler than the historical average by -0.9 °F.

  • The forecast for the next days in Yellowstone National Park predicts a temperature of 13.3 °F, which is cooler than the historical average.

  • In general, the average temperature in Yellowstone National Park at the beginning of September is 21.7 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 11 °F by the end of September.

    • Rain 🌧️

  • With an average of 3 rainy days, Yellowstone National Park experiences minimal rainfall in September.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
24
Dry days
Average rainy days
3
Rainy days
Average snowy days
3
Snow days
Average temperatures
17°/5°
Temperatures
Average wind speed
21 km/h
Avg max wind
Average humidity
48 %
Avg humidity

Yellowstone National Park Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Sunny
24°
2
Patchy rain possible
24°
3
Patchy rain possible
20°
4
Partly cloudy
20°
5
Sunny
20°
6
Sunny
22°
7
Partly cloudy
22°
8
Patchy rain possible
21°
9
Sunny
20°
10
Overcast
21°
11
Patchy light drizzle
18°
12
Moderate or heavy snow with thunder
11°
13
Moderate or heavy snow showers
9°
14
Sunny
16°
15
Patchy rain possible
19°
16
Weather Alert Moderate rain
11°
17
Thundery outbreaks possible
12°
18
Sunny
16°
19
Sunny
21°
20
Patchy rain possible
17°
21
Patchy rain possible
10°
22
Sunny
14°
23
Sunny
17°
24
Sunny
21°
25
Sunny
23°
26
Patchy rain possible
18°
27
Patchy rain possible
2°
28
Moderate or heavy snow showers
1°
29
Light freezing rain
3°
30
Overcast
9°

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

Click on a date for more information
August October
Date Weather Temperatures Rain Snow More
Sept. 1 Sunny
Sunny
 24° /7° 0 mm 0 cm
Sept. 2 Patchy rain possible
Patchy rain possible
 24° /8° 0.2 mm 0 cm
Sept. 3 Patchy rain possible
Patchy rain possible
 20° /9° 0.3 mm 0 cm
Sept. 4 Partly cloudy
Partly cloudy
 20° /7° 0 mm 0 cm
Sept. 5 Sunny
Sunny
 20° /6° 0 mm 0 cm
Sept. 6 Sunny
Sunny
 22° /4° 0 mm 0 cm
Sept. 7 Partly cloudy
Partly cloudy
 22° /7° 2.3 mm 0 cm
Sept. 8 Patchy rain possible
Patchy rain possible
 21° /6° 0.2 mm 0 cm
Sept. 9 Sunny
Sunny
 20° /7° 0.1 mm 0 cm
Sept. 10 Overcast
Overcast
 21° /6° 0 mm 0 cm
Sept. 11 Patchy light drizzle
Patchy light drizzle
 18° /6° 1.1 mm 0 cm
Sept. 12 Moderate or heavy snow with thunder
Moderate or heavy snow with thunder
 11° /3° 8.1 mm 2.9 cm
Sept. 13 Moderate or heavy snow showers
Moderate or heavy snow showers
 9° /3° 29.2 mm 0.1 cm
Sept. 14 Sunny
Sunny
 16° /1° 0 mm 0 cm
Sept. 15 Patchy rain possible
Patchy rain possible
 19° /3° 0.1 mm 0 cm
Sept. 16 Moderate rain
Moderate rain
 11° /4° 7.1 mm 0 cm
Sept. 17 Thundery outbreaks possible
Thundery outbreaks possible
 12° /6° 0 mm 0 cm
Sept. 18 Sunny
Sunny
 16° /-2° 0 mm 0 cm
Sept. 19 Sunny
Sunny
 21° /4° 0 mm 0 cm
Sept. 20 Patchy rain possible
Patchy rain possible
 17° /7° 1.7 mm 0 cm
Sept. 21 Patchy rain possible
Patchy rain possible
 10° /3° 1.2 mm 0 cm
Sept. 22 Sunny
Sunny
 14° /-1° 0 mm 0 cm
Sept. 23 Sunny
Sunny
 17° /4° 0 mm 0 cm
Sept. 24 Sunny
Sunny
 21° /5° 0 mm 0 cm
Sept. 25 Sunny
Sunny
 23° /7° 0 mm 0 cm
Sept. 26 Patchy rain possible
Patchy rain possible
 18° /7° 1.4 mm 0 cm
Sept. 27 Patchy rain possible
Patchy rain possible
 2° /-2° 4.3 mm 3.1 cm
Sept. 28 Moderate or heavy snow showers
Moderate or heavy snow showers
 1° /-5° 2.1 mm 1.5 cm
Sept. 29 Light freezing rain
Light freezing rain
 3° /-9° 0.4 mm 0.2 cm
Sept. 30 Overcast
Overcast
 9° /3° 0 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.
Change Month
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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 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 3 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 14.75 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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Location coordinates 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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