Rapid City (SD)
August
Weather in Rapid City, South Dakota for August 2025
Your guide to Rapid City weather in August - trends and predictions
The forecast for the first days of August 2025 in Rapid City predicts a temperature of 35.2 °F, which is slightly above the historical average.
In general, the average temperature in Rapid City at the beginning of August is 32.3 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 29.1 °F by the end of August.
Rapid City experiences moderate rainfall in August, with an average of 9 rainy days and a total precipitation of 22.8 mm.
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Temperatures
Rain 🌧️
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22
Dry days
9
Rainy days
0
Snow days
30°/17°
Temperatures
24 km/h
Avg max wind
44 %
Avg humidity
Rapid City Weather August
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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
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Aug. 1 |  Patchy rain possible | 30° /19° | 0.2 mm | 5 | |
| Aug. 2 |  Sunny | 37° /21° | 0 mm | 9 | |
| Aug. 3 |  Cloudy | 37° /22° | 0 mm | 8 | |
| Aug. 4 | Cloudy | 36° /20° | 0 mm | 8 | |
| Aug. 5 |  Overcast | 29° /16° | 0.1 mm | 6 | |
| Aug. 6 | Patchy rain possible | 31° /16° | 0.4 mm | 7 | |
| Aug. 7 |  Moderate or heavy rain shower | 26° /16° | 5.3 mm | 6 | |
| Aug. 8 |  Partly cloudy | 21° /14° | 0.4 mm | 6 | |
| Aug. 9 | Partly cloudy | 23° /11° | 0 mm | 6 | |
| Aug. 10 | Overcast | 26° /13° | 0 mm | 6 | |
| Aug. 11 | Patchy rain possible | 23° /15° | 3.5 mm | 5 | |
| Aug. 12 | Cloudy | 25° /12° | 0.4 mm | 6 | |
| Aug. 13 | Overcast | 31° /19° | 0 mm | 7 | |
| Aug. 14 | Patchy rain possible | 29° /18° | 0.1 mm | 6 | |
| Aug. 15 | Cloudy | 28° /17° | 0 mm | 6 | |
| Aug. 16 | Patchy rain possible | 30° /17° | 0.4 mm | 7 | |
| Aug. 17 | Sunny | 30° /16° | 0 mm | 8 | |
| Aug. 18 | Moderate rain at times | 31° /20° | 1.3 mm | 7 | |
| Aug. 19 | Patchy rain possible | 31° /19° | 0.3 mm | 7 | |
| Aug. 20 | Sunny | 32° /18° | 0 mm | 8 | |
| Aug. 21 | Partly cloudy | 37° /19° | 0 mm | 9 | |
| Aug. 22 | Sunny | 32° /22° | 0 mm | 8 | |
| Aug. 23 | Sunny | 32° /19° | 0 mm | 8 | |
| Aug. 24 | Partly cloudy | 37° /22° | 0 mm | 9 | |
| Aug. 25 | Cloudy | 31° /23° | 0 mm | 7 | |
| Aug. 26 | Moderate or heavy rain shower | 25° /16° | 10.6 mm | 6 | |
| Aug. 27 | Sunny | 26° /13° | 0 mm | 7 | |
| Aug. 28 | Sunny | 34° /16° | 0 mm | 8 | |
| Aug. 29 | Sunny | 27° /15° | 0 mm | 7 | |
| Aug. 30 | Sunny | 29° /14° | 0 mm | 7 | |
| Aug. 31 | Sunny | 32° /19° | 0 mm | 8 | |
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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.
Change Month
Rapid City in August - FAQ
What are the expected maximum and minimum temperatures in Rapid City during August?
Expect warm days with temperatures around 30°, cooling to mild conditions of 17° after sunset. Perfect for those who enjoy warm weather.
How much rainfall should be expected in Rapid City during August?
In August, Rapid City can expect light to moderate rainfall, totaling 22.8 mm across approximately 9 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Rapid City during August?
The average wind speed in Rapid City during August is 24 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 💧
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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