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Park County (Yellowstone National Park)
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United States weather

Weather in Park County, Wyoming for September 2025

Your guide to Park County weather in September - trends and predictions

    Official Weather Alert ⚠️

  • Freeze Warning - See hour by hour.

    • Snow Forecast ❄️

  • With an average of 3 snowy days, Park County usually enjoys a light touch of snow in September.
    According to Park County 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 Park County is slightly cooler than the historical average by -0.9 °F.

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

  • In general, the average temperature in Park County 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, Park County 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

Park County 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
13°
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 Park County

See the weather trend as well as the moving average line

September weather in Park County 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
 13° /4° 0 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 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.
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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 3 days. Considering plans for rainy days is advisable.
Will it snow in Park County in September 2025?
Park County experiences an average snowfall of 14.75 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 ☀️
Top locations in Park County
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Yellowstone National Park
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Location coordinates 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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