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Weather in Rapid City, South Dakota for August 2026

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

    Temperatures

  • So far, August 2026 in Rapid City is slightly warmer than the historical average by 2 °F.

  • The forecast for the upcoming days in Rapid City predicts a temperature of 32.1 °F, which is slightly above the historical average.

  • In general, the average temperature in Rapid City at the beginning of August is 32 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 28.1 °F by the end of August.

    • Rain 🌧️

  • The climate of Rapid City in August is notably wet, with an average of 14 rainy days, and a total of 64.5 mm of precipitation.

    • More

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

Average dry days
17
Dry days
Average rainy days
14
Rainy days
Average snowy days
0
Snow days
Average temperatures
29°/18°
Temperatures
Average wind speed
22 km/h
Avg max wind
Average humidity
51 %
Avg humidity

Rapid City Weather August

Move between months or click on a day
July
September
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Sunny
32°
2
Sunny
36°
3
Cloudy
30°
4
Cloudy
31°
5
Overcast
30°
6
Patchy rain possible
33°
7
Moderate or heavy rain shower
32°
8
Partly cloudy
29°
9
Partly cloudy
28°
10
Overcast
29°
11
Patchy rain possible
29°
12
Sunny
32°
13
Partly cloudy
28°
14
Partly cloudy
30°
15
Patchy rain possible
26°
16
Sunny
32°
17
Sunny
34°
18
Sunny
31°
19
Sunny
27°
20
Sunny
29°
21
Sunny
33°
22
Sunny
39°
23
Sunny
34°
24
Sunny
36°
25
Sunny
39°
26
Moderate or heavy rain shower
26°
27
Sunny
26°
28
Sunny
28°
29
Sunny
24°
30
Sunny
25°
31
Sunny
29°

Temperatures trend during August in Rapid City

See the weather trend as well as the moving average line

August weather in Rapid City day by day

Click on a date for more information
July September
Date Weather Temperatures Rain UV More
Aug. 1 Sunny
Sunny
 32° /17° 0 mm 8
Aug. 2 Sunny
Sunny
 36° /20° 0 mm 9
Aug. 3 Cloudy
Cloudy
 30° /19° 0 mm 8
Aug. 4 Cloudy
Cloudy
 31° /16° 0 mm 9
Aug. 5 Overcast
Overcast
 30° /15° 0.8 mm 8
Aug. 6 Patchy rain possible
Patchy rain possible
 33° /17° 1.3 mm 8
Aug. 7 Moderate or heavy rain shower
Moderate or heavy rain shower
 32° /18° 1.8 mm 8
Aug. 8 Partly cloudy
Partly cloudy
 29° /16° 0.1 mm 7
Aug. 9 Partly cloudy
Partly cloudy
 28° /15° 0 mm 8
Aug. 10 Overcast
Overcast
 29° /15° 0.1 mm 8
Aug. 11 Patchy rain possible
Patchy rain possible
 29° /17° 1.8 mm 8
Aug. 12 Sunny
Sunny
 32° /16° 21.8 mm 3.9
Aug. 13 Partly cloudy
Partly cloudy
 28° /18° 5.1 mm 6.7
Aug. 14 Partly cloudy
Partly cloudy
 30° /18° 1.1 mm 8.1
Aug. 15 Patchy rain possible
Patchy rain possible
 26° /16° 3.7 mm 7.4
Aug. 16 Sunny
Sunny
 32° /16° 0.6 mm 8
Aug. 17 Sunny
Sunny
 34° /18° 0.1 mm 8
Aug. 18 Sunny
Sunny
 31° /20° 2.8 mm 8
Aug. 19 Sunny
Sunny
 27° /17° 8.1 mm 7
Aug. 20 Sunny
Sunny
 29° /16° 0.1 mm 7
Aug. 21 Sunny
Sunny
 33° /16° 0 mm 8
Aug. 22 Sunny
Sunny
 39° /19° 0 mm 9
Aug. 23 Sunny
Sunny
 34° /19° 0 mm 8
Aug. 24 Sunny
Sunny
 36° /19° 0 mm 9
Aug. 25 Sunny
Sunny
 39° /24° 0 mm 9
Aug. 26 Moderate or heavy rain shower
Moderate or heavy rain shower
 26° /15° 5.3 mm 6
Aug. 27 Sunny
Sunny
 26° /14° 0 mm 7
Aug. 28 Sunny
Sunny
 28° /16° 8.4 mm 7
Aug. 29 Sunny
Sunny
 24° /15° 1.5 mm 6
Aug. 30 Sunny
Sunny
 25° /14° 9.7 mm 6
Aug. 31 Sunny
Sunny
 29° /16° 0.5 mm 8
Next
Important Notice
Our weather forecast for Rapid City in August 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.
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Rapid City in August - FAQ

What are the expected maximum and minimum temperatures in Rapid City during August?
During August, expect a variety of temperatures with highs around 29° and lows near 18°, suitable for diverse activities and preferences.

How much rainfall should be expected in Rapid City during August?
Moderate rainfall is anticipated in Rapid City during August, with a total of 64.5 mm spread over approximately 14 days. Considering plans for rainy days is advisable.

What are the typical wind conditions in Rapid City during August?
The average wind speed in Rapid City during August is 22 km/h, suggesting breezy to windy conditions, depending on your activities.

August rainfall patterns in Rapid City

Explore the daily rainfall trends and prepare for Rapid Citys August weather 💧
Typically, Rapid City has 14 rainy days in August with a total of 64.5 mm of rainfall.

UV exposure in Rapid City during August

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

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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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