South Dakota (Rapid City)
August
Weather in South Dakota for August 2026
Your guide to South Dakota weather in August - trends and predictions
So far, August 2026 in South Dakota is slightly warmer than the historical average by 2 °F.
The forecast for the upcoming days in South Dakota predicts a temperature of 32.1 °F, which is slightly above the historical average.
In general, the average temperature in South Dakota 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.
The climate of South Dakota in August is notably wet, with an average of 14 rainy days, and a total of 64.5 mm of precipitation.
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Temperatures
Rain 🌧️
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17
Dry days
14
Rainy days
0
Snow days
29°/18°
Temperatures
22 km/h
Avg max wind
51 %
Avg humidity
South Dakota Weather August
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What’s the Weather Like in South Dakota This August?
Discover the average temperatures and weather trends across South Dakota’s cities this August.
Temperatures trend during August in South Dakota
See the weather trend as well as the moving average line
August weather in South Dakota day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Aug. 1 |  Sunny | 32° /17° | 0 mm | 8 | |
| Aug. 2 | Sunny | 36° /20° | 0 mm | 9 | |
| Aug. 3 |  Cloudy | 30° /19° | 0 mm | 8 | |
| Aug. 4 | Cloudy | 31° /16° | 0 mm | 9 | |
| Aug. 5 |  Overcast | 30° /15° | 0.8 mm | 8 | |
| Aug. 6 |  Patchy rain possible | 33° /17° | 1.3 mm | 8 | |
| Aug. 7 |  Moderate or heavy rain shower | 32° /18° | 1.8 mm | 8 | |
| Aug. 8 |  Partly cloudy | 29° /16° | 0.1 mm | 7 | |
| Aug. 9 | Partly cloudy | 28° /15° | 0 mm | 8 | |
| Aug. 10 | Overcast | 29° /15° | 0.1 mm | 8 | |
| Aug. 11 | Patchy rain possible | 29° /17° | 1.8 mm | 8 | |
| Aug. 12 | Sunny | 32° /16° | 21.8 mm | 3.9 | |
| Aug. 13 | Partly cloudy | 28° /18° | 5.1 mm | 6.7 | |
| Aug. 14 | Partly cloudy | 30° /18° | 1.1 mm | 8.1 | |
| Aug. 15 | Patchy rain possible | 26° /16° | 3.7 mm | 7.4 | |
| Aug. 16 | Sunny | 32° /16° | 0.6 mm | 8 | |
| Aug. 17 | Sunny | 34° /18° | 0.1 mm | 8 | |
| Aug. 18 | Sunny | 31° /20° | 2.8 mm | 8 | |
| Aug. 19 | Sunny | 27° /17° | 8.1 mm | 7 | |
| Aug. 20 | Sunny | 29° /16° | 0.1 mm | 7 | |
| Aug. 21 | Sunny | 33° /16° | 0 mm | 8 | |
| Aug. 22 | Sunny | 39° /19° | 0 mm | 9 | |
| Aug. 23 | Sunny | 34° /19° | 0 mm | 8 | |
| Aug. 24 | Sunny | 36° /19° | 0 mm | 9 | |
| Aug. 25 | Sunny | 39° /24° | 0 mm | 9 | |
| Aug. 26 | Moderate or heavy rain shower | 26° /15° | 5.3 mm | 6 | |
| Aug. 27 | Sunny | 26° /14° | 0 mm | 7 | |
| Aug. 28 | Sunny | 28° /16° | 8.4 mm | 7 | |
| Aug. 29 | Sunny | 24° /15° | 1.5 mm | 6 | |
| Aug. 30 | Sunny | 25° /14° | 9.7 mm | 6 | |
| Aug. 31 | Sunny | 29° /16° | 0.5 mm | 8 | |
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Important Notice
Our weather forecast for South Dakota 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 South Dakota forecast closer to your planned date for the most up-to-date weather information.
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South Dakota in August - FAQ
What are the expected maximum and minimum temperatures in South Dakota 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 South Dakota during August?
Moderate rainfall is anticipated in South Dakota 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 South Dakota during August?
The average wind speed in South Dakota during August is 22 km/h, suggesting breezy to windy conditions, depending on your activities.
August rainfall patterns in South Dakota
Explore the daily rainfall trends and prepare for South Dakotas August weather 💧
Typically, South Dakota has 14 rainy days in August with a total of 64.5 mm of rainfall.
UV exposure in South Dakota during August
Stay informed about UV levels for safe outdoor activities throughout the month of August ☀️
Counties in South Dakota
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Where is South Dakota?Get accurate weather forecasts for South Dakota, located at latitude 44.081 and longitude -103.231. Stay updated with localized weather information tailored for South Dakota.
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