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Park County (Yellowstone National Park)
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United States weather

Weather in Park County, Wyoming for September 2026

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

    Snow Forecast ❄️

  • With an average of 3 snowy days, Park County usually enjoys a light touch of snow in September.

    • Temperatures

  • 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 17.1 °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
Patchy rain possible
14°
17
Light rain shower
13°
18
Moderate or heavy rain shower
10°
19
Mist
15°
20
Partly cloudy
16°
21
Partly cloudy
16°
22
Sunny
11°
23
Cloudy
14°
24
Sunny
18°
25
Sunny
19°
26
Sunny
17°
27
Sunny
18°
28
Sunny
19°
29
Partly cloudy
18°
30
Overcast
11°

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 Patchy rain possible
Patchy rain possible
 14° /4° 0.8 mm 0 cm
Sept. 17 Light rain shower
Light rain shower
 13° /4° 2.3 mm 0 cm
Sept. 18 Moderate or heavy rain shower
Moderate or heavy rain shower
 10° /0° 20.5 mm 4.3 cm
Sept. 19 Mist
Mist
 15° /4° 0 mm 0 cm
Sept. 20 Partly cloudy
Partly cloudy
 16° /2° 0 mm 0 cm
Sept. 21 Partly cloudy
Partly cloudy
 16° /5° 2.3 mm 0 cm
Sept. 22 Sunny
Sunny
 11° /1° 1.4 mm 0 cm
Sept. 23 Cloudy
Cloudy
 14° /2° 0 mm 0 cm
Sept. 24 Sunny
Sunny
 18° /3° 0 mm 0 cm
Sept. 25 Sunny
Sunny
 19° /5° 0 mm 0 cm
Sept. 26 Sunny
Sunny
 17° /6° 0 mm 0 cm
Sept. 27 Sunny
Sunny
 18° /3° 0 mm 0 cm
Sept. 28 Sunny
Sunny
 19° /4° 0 mm 0 cm
Sept. 29 Partly cloudy
Partly cloudy
 18° /5° 0 mm 0 cm
Sept. 30 Overcast
Overcast
 11° /5° 2.2 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 2026?
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 2026

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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