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United States weather

Weather in Rapid City, South Dakota for September 2027

Your guide to Rapid City weather in September - trends and predictions

    Temperatures

  • In general, the average temperature in Rapid City at the beginning of September is 29.3 °C. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 26.9 °C by the end of September.

    • Rain 🌧️

  • Rapid City experiences moderate rainfall in September, with an average of 7 rainy days and a total precipitation of 99.2 mm.

    • More

  • Is September a good time to visit Rapid City? check out the best time to travel to Rapid City page.

  • ✨ Is September a good time to visit Rapid City? – Ask the AI Weatherman

Average dry days
23
Dry days
Average rainy days
7
Rainy days
Average snowy days
0
Snow days
Average temperatures
27°/14°
Temperatures
Average wind speed
24 km/h
Avg max wind
Average humidity
47 %
Avg humidity

Rapid City Weather September

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

Temperatures trend during September in Rapid City

See the weather trend as well as the moving average line

September weather in Rapid City day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Patchy rain possible
Patchy rain possible
 28° /15° 1.3 mm 5
Sept. 2 Sunny
Sunny
 33° /17° 0 mm 7.3
Sept. 3 Overcast
Overcast
 31° /18° 0 mm 7
Sept. 4 Patchy rain possible
Patchy rain possible
 30° /16° 0.5 mm 6
Sept. 5 Sunny
Sunny
 26° /14° 0.1 mm 7
Sept. 6 Sunny
Sunny
 27° /12° 0 mm 6
Sept. 7 Light rain
Light rain
 30° /14° 3.2 mm 6
Sept. 8 Sunny
Sunny
 30° /16° 0 mm 6.8
Sept. 9 Patchy rain possible
Patchy rain possible
 30° /16° 1.4 mm 6.7
Sept. 10 Sunny
Sunny
 33° /16° 0 mm 6.6
Sept. 11 Partly cloudy
Partly cloudy
 31° /17° 0 mm 6.5
Sept. 12 Patchy rain possible
Patchy rain possible
 28° /16° 1.3 mm 6
Sept. 13 Moderate rain at times
Moderate rain at times
 24° /13° 5.1 mm 6
Sept. 14 Moderate rain
Moderate rain
 24° /13° 12.1 mm 5
Sept. 15 Partly cloudy
Partly cloudy
 27° /12° 0 mm 6.1
Sept. 16 Partly cloudy
Partly cloudy
 27° /14° 0 mm 5
Sept. 17 Heavy rain
Heavy rain
 22° /15° 31.4 mm 4
Sept. 18 Heavy rain
Heavy rain
 23° /13° 30.6 mm 5
Sept. 19 Patchy rain possible
Patchy rain possible
 22° /13° 1.6 mm 4
Sept. 20 Light rain
Light rain
 23° /12° 7.3 mm 5
Sept. 21 Patchy rain possible
Patchy rain possible
 20° /12° 2.1 mm 4
Sept. 22 Sunny
Sunny
 22° /11° 0.3 mm 5.5
Sept. 23 Overcast
Overcast
 23° /11° 0.2 mm 4
Sept. 24 Sunny
Sunny
 25° /13° 0 mm 5.3
Sept. 25 Sunny
Sunny
 27° /14° 0 mm 5.2
Sept. 26 Sunny
Sunny
 29° /16° 0 mm 5.1
Sept. 27 Sunny
Sunny
 23° /13° 0.1 mm 5
Sept. 28 Sunny
Sunny
 28° /15° 0.4 mm 4.9
Sept. 29 Sunny
Sunny
 30° /18° 0.1 mm 4.8
Sept. 30 Sunny
Sunny
 26° /13° 0 mm 4.8
Next
Important Notice
Our weather forecast for Rapid City 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 Rapid City forecast closer to your planned date for the most up-to-date weather information.
Change Month
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Rapid City in September - FAQ

What are the expected maximum and minimum temperatures in Rapid City during September?
Enjoy moderate daytime temperatures of up to 27° and cooler nights around 14°. Ideal for a range of outdoor activities, from hiking to city tours.

How much rainfall should be expected in Rapid City during September?
Moderate rainfall is anticipated in Rapid City during September, with a total of 99.2 mm spread over approximately 7 days. Considering plans for rainy days is advisable.

What are the typical wind conditions in Rapid City during September?
The average wind speed in Rapid City during September is 24 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Rapid City

Explore the daily rainfall trends and prepare for Rapid Citys September weather 💧
Typically, Rapid City has 7 rainy days in September with a total of 99.2 mm of rainfall.

UV exposure in Rapid City during September

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

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

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