easeweather.com
Rapid City (SD)
Akron (OH)Albuquerque (NM)Alexandria (VA)Anaheim (CA)Anchorage (AK)Arlington (VA)Atlanta (GA)Atlantic City (NJ)Austin (TX)Baltimore (MD)Baton Rouge (LA)Birmingham (AL)Boston (MA)Brooklyn (NY)Buffalo (NY)Cape Coral (FL)Charlotte (NC)Chattanooga (TN)Chicago (IL)Cincinnati (OH)Cleveland (OH)Colorado Springs (CO)Columbus (OH)Corpus Christi (TX)Dallas (TX)Dayton (OH)Denver (CO)Des Moines (IA)Detroit (MI)El Paso (TX)Fairbanks (AK)Fayetteville (NC)Fort Lauderdale (FL)Fort Wayne (IN)Fort Worth (TX)Gatlinburg (TN)Grand Rapids (MI)Harrisburg (PA)Honolulu (HI)Houston (TX)Huntsville (AL)Indianapolis (IN)Jackson (MS)Jacksonville (FL)Juneau (AK)Kansas City (MO)Ketchikan (AK)Key West (FL)Knoxville (TN)Las Vegas (NV)Lexington (KY)Lincoln (NE)Little Rock (AR)Los Angeles (CA)Louisville (KY)Madison (WI)Manhattan (NY)Memphis (TN)Miami (FL)Milwaukee (WI)Minneapolis (MN)Mobile (AL)Montgomery (AL)Nashville (TN)New Orleans (LA)New York City (NY)Newark (NJ)Oklahoma City (OK)Omaha (NE)Orlando (FL)Philadelphia (PA)Phoenix (AZ)Pittsburgh (PA)Portland (OR)
Rapid City (SD)
Richmond (VA)Riverside (CA)Sacramento (CA)Salt Lake City (UT)San Antonio (TX)San Diego (CA)San Francisco (CA)San Jose (CA)Savannah (GA)Seattle (WA)Sitka (AK)Skagway (AK)Springfield (MO)St. Louis (MO)St. Petersburg (FL)Tallahassee (FL)Tampa (FL)Toledo (OH)Traverse City (MI)Tulsa (OK)Tyler (TX)Vancouver (WA)Virginia Beach (VA)WashingtonWichita (KS)Winston-Salem (NC) More Locations
United States weather

Weather in Rapid City, South Dakota for September 2025

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

    Temperatures

  • Until now, September 2025 in Rapid City is cooler than usual, with temperatures averaging 26.5 °F, this is -2.3 °F below the typical seasonal average.

  • The forecast for the next days in Rapid City predicts a temperature of 22.8 °F, which is cooler than the historical average.

  • In general, the average temperature in Rapid City at the beginning of September is 27.4 °F. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 25.1 °F by the end of September.

    • Rain 🌧️

  • With an average of 4 rainy days, Rapid City experiences minimal rainfall in September.

    • More

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

Average dry days
26
Dry days
Average rainy days
4
Rainy days
Average snowy days
0
Snow days
Average temperatures
29°/15°
Temperatures
Average wind speed
26 km/h
Avg max wind
Average humidity
34 %
Avg humidity

Rapid City Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Sunny
29°
2
Sunny
33°
3
Overcast
29°
4
Heavy rain at times
27°
5
Partly cloudy
23°
6
Sunny
23°
7
Sunny
28°
8
Sunny
31°
9
Cloudy
32°
10
Partly cloudy
32°
11
Partly cloudy
32°
12
Moderate or heavy rain shower
31°
13
Moderate rain at times
24°
14
Overcast
24°
15
Partly cloudy
30°
16
Cloudy
22°
17
Heavy rain
17°
18
Heavy rain
21°
19
Patchy rain possible
18°
20
Sunny
24°
21
Partly cloudy
25°
22
Sunny
23°
23
Sunny
22°
24
Sunny
27°
25
Sunny
32°
26
Patchy rain possible
22°
27
Patchy rain possible
15°
28
Sunny
21°
29
Sunny
35°
30
Sunny
24°

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 Sunny
Sunny
 29° /15° 0 mm 7
Sept. 2 Sunny
Sunny
 33° /18° 0 mm 9
Sept. 3 Overcast
Overcast
 29° /17° 0 mm 7
Sept. 4 Heavy rain at times
Heavy rain at times
 27° /16° 0.6 mm 7
Sept. 5 Partly cloudy
Partly cloudy
 23° /11° 0 mm 7
Sept. 6 Sunny
Sunny
 23° /9° 0 mm 6
Sept. 7 Sunny
Sunny
 28° /11° 0 mm 7
Sept. 8 Sunny
Sunny
 31° /17° 0 mm 7
Sept. 9 Cloudy
Cloudy
 32° /18° 2.2 mm 7
Sept. 10 Partly cloudy
Partly cloudy
 32° /17° 0 mm 8
Sept. 11 Partly cloudy
Partly cloudy
 32° /17° 0 mm 8
Sept. 12 Moderate or heavy rain shower
Moderate or heavy rain shower
 31° /18° 1.8 mm 7
Sept. 13 Moderate rain at times
Moderate rain at times
 24° /15° 6.4 mm 6
Sept. 14 Overcast
Overcast
 24° /13° 17.8 mm 5
Sept. 15 Partly cloudy
Partly cloudy
 30° /15° 0 mm 1.3
Sept. 16 Cloudy
Cloudy
 22° /15° 0 mm 1.1
Sept. 17 Heavy rain
Heavy rain
 17° /13° 102.9 mm 0.5
Sept. 18 Heavy rain
Heavy rain
 21° /13° 86.6 mm 1
Sept. 19 Patchy rain possible
Patchy rain possible
 18° /12° 2.4 mm 0
Sept. 20 Sunny
Sunny
 24° /11° 0 mm 5
Sept. 21 Partly cloudy
Partly cloudy
 25° /15° 0.1 mm 5
Sept. 22 Sunny
Sunny
 23° /14° 0 mm 5
Sept. 23 Sunny
Sunny
 22° /10° 0 mm 5
Sept. 24 Sunny
Sunny
 27° /12° 0 mm 5
Sept. 25 Sunny
Sunny
 32° /16° 0 mm 6
Sept. 26 Patchy rain possible
Patchy rain possible
 22° /14° 0.6 mm 4
Sept. 27 Patchy rain possible
Patchy rain possible
 15° /9° 3.5 mm 3
Sept. 28 Sunny
Sunny
 21° /7° 0 mm 4
Sept. 29 Sunny
Sunny
 35° /22° 0 mm 9
Sept. 30 Sunny
Sunny
 24° /10° 0 mm 6
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
‹
›

Rapid City in September - FAQ

What are the expected maximum and minimum temperatures in Rapid City during September?
During September, expect a variety of temperatures with highs around 29° and lows near 15°, suitable for diverse activities and preferences.
How much rainfall should be expected in Rapid City during September?
Expect minimal rainfall in Rapid City during September, with a total of 16.2 mm over approximately 4 days. This minimal precipitation is unlikely to significantly impact plans.
What are the typical wind conditions in Rapid City during September?
The average wind speed in Rapid City during September is 26 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 💧

UV exposure in Rapid City during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

Quick links

More Rapid City weather pages
You are here
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.

Found a mistake?
We appreciate your attention to details. Tell us here.