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Pennington County (Rapid City)
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United States weather

Weather in Pennington County, South Dakota for September 2026

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

    Temperatures

  • Until now, September 2026 in Pennington County has been nearly identical to the historical average, with a temperature of 26.4 °F (showing only a slight deviation of 0.5 °F).

  • The forecast for the next days in Pennington County predicts temperatures to be around 24 °F, close to the historical average.

  • In general, the average temperature in Pennington County at the beginning of September is 29.6 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 25.6 °F by the end of September.

    • Rain 🌧️

  • Pennington County experiences moderate rainfall in September, with an average of 7 rainy days and a total precipitation of 116.4 mm.

    • More

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

Average dry days
23
Dry days
Average rainy days
7
Rainy days
Average snowy days
0
Snow days
Average temperatures
27°/15°
Temperatures
Average wind speed
25 km/h
Avg max wind
Average humidity
45 %
Avg humidity

Pennington County Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Sunny
28°
2
Sunny
33°
3
Overcast
32°
4
Heavy rain at times
30°
5
Sunny
27°
6
Sunny
27°
7
Sunny
30°
8
Sunny
30°
9
Cloudy
31°
10
Sunny
33°
11
Partly cloudy
31°
12
Moderate or heavy rain shower
28°
13
Moderate rain at times
24°
14
Overcast
25°
15
Partly cloudy
27°
16
Partly cloudy
28°
17
Moderate or heavy rain shower
22°
18
Sunny
23°
19
Sunny
22°
20
Sunny
23°
21
Sunny
20°
22
Sunny
22°
23
Overcast
23°
24
Sunny
25°
25
Sunny
27°
26
Sunny
32°
27
Partly cloudy
21°
28
Overcast
27°
29
Overcast
23°
30
Sunny
24°

Temperatures trend during September in Pennington County

See the weather trend as well as the moving average line

September weather in Pennington County day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Sunny
Sunny
 28° /15° 1.3 mm 5
Sept. 2 Sunny
Sunny
 33° /16° 0 mm 8
Sept. 3 Overcast
Overcast
 32° /18° 0 mm 7
Sept. 4 Heavy rain at times
Heavy rain at times
 30° /16° 0.5 mm 6
Sept. 5 Sunny
Sunny
 27° /14° 0.1 mm 7
Sept. 6 Sunny
Sunny
 27° /12° 0 mm 6
Sept. 7 Sunny
Sunny
 30° /13° 3.2 mm 6
Sept. 8 Sunny
Sunny
 30° /16° 0 mm 7
Sept. 9 Cloudy
Cloudy
 31° /16° 1.4 mm 7
Sept. 10 Sunny
Sunny
 33° /16° 0 mm 8
Sept. 11 Partly cloudy
Partly cloudy
 31° /17° 0 mm 7
Sept. 12 Moderate or heavy rain shower
Moderate or heavy rain shower
 28° /15° 1.3 mm 6
Sept. 13 Moderate rain at times
Moderate rain at times
 24° /13° 5.1 mm 6
Sept. 14 Overcast
Overcast
 25° /13° 12.1 mm 5
Sept. 15 Partly cloudy
Partly cloudy
 27° /12° 0 mm 7
Sept. 16 Partly cloudy
Partly cloudy
 28° /14° 0 mm 5
Sept. 17 Moderate or heavy rain shower
Moderate or heavy rain shower
 22° /14° 31.4 mm 4
Sept. 18 Sunny
Sunny
 23° /13° 30.6 mm 5
Sept. 19 Sunny
Sunny
 22° /13° 1.6 mm 4
Sept. 20 Sunny
Sunny
 23° /12° 7.3 mm 5
Sept. 21 Sunny
Sunny
 20° /11° 2.1 mm 4
Sept. 22 Sunny
Sunny
 22° /11° 0.3 mm 6
Sept. 23 Overcast
Overcast
 23° /11° 0.2 mm 4
Sept. 24 Sunny
Sunny
 25° /13° 0 mm 6
Sept. 25 Sunny
Sunny
 27° /13° 0 mm 6
Sept. 26 Sunny
Sunny
 32° /18° 0 mm 8
Sept. 27 Partly cloudy
Partly cloudy
 21° /12° 2.7 mm 4.5
Sept. 28 Overcast
Overcast
 27° /16° 0.2 mm 4.7
Sept. 29 Overcast
Overcast
 23° /14° 0 mm 4.8
Sept. 30 Sunny
Sunny
 24° /15° 0 mm 5.2
Next
Important Notice
Our weather forecast for Pennington 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 Pennington County forecast closer to your planned date for the most up-to-date weather information.
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Pennington County in September - FAQ

What are the expected maximum and minimum temperatures in Pennington County during September?
During September, expect a variety of temperatures with highs around 27° and lows near 15°, suitable for diverse activities and preferences.

How much rainfall should be expected in Pennington County during September?
Significant rainfall exceeding 116.4 mm is expected in Pennington County during September, occurring over more than 7 days. Preparing for wet conditions is recommended in your planning.

What are the typical wind conditions in Pennington County during September?
The average wind speed in Pennington County during September is 25 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Pennington County

Explore the daily rainfall trends and prepare for Pennington Countys September weather 💧
Typically, Pennington County has 7 rainy days in September with a total of 116.4 mm of rainfall.

UV exposure in Pennington County during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Location coordinates Where is Pennington County?

Get accurate weather forecasts for Pennington County, located at latitude 44.081 and longitude -103.231. Stay updated with localized weather information tailored for Pennington County.

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