Sioux Falls (SD)
August
Weather in Sioux Falls, South Dakota for August 2026
Your guide to Sioux Falls weather in August - trends and predictions
In general, the average temperature in Sioux Falls at the beginning of August is 27.7 °C. As the month progressed, temperatures tended to significantly warm up, reaching an average of 30.9 °C by the end of August.
The climate of Sioux Falls in August is notably wet, with an average of 14 rainy days, and a total of 105.9 mm of precipitation.
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Temperatures
Rain 🌧️
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17
Dry days
14
Rainy days
0
Snow days
28°/16°
Temperatures
22 km/h
Avg max wind
69 %
Avg humidity
Sioux Falls Weather August
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Temperatures trend during August in Sioux Falls
See the weather trend as well as the moving average line
August weather in Sioux Falls day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Aug. 1 |  Overcast | 27° /15° | 0.1 mm | 6 | |
| Aug. 2 |  Patchy rain possible | 29° /16° | 0.3 mm | 7 | |
| Aug. 3 | Overcast | 30° /18° | 3 mm | 7 | |
| Aug. 4 | Overcast | 31° /18° | 9.3 mm | 7 | |
| Aug. 5 |  Moderate or heavy rain shower | 26° /16° | 19.5 mm | 6 | |
| Aug. 6 | Moderate rain at times | 24° /17° | 3 mm | 5 | |
| Aug. 7 | Overcast | 27° /15° | 5.1 mm | 6 | |
| Aug. 8 | Overcast | 27° /16° | 0 mm | 6 | |
| Aug. 9 |  Heavy rain at times | 26° /15° | 0.7 mm | 6 | |
| Aug. 10 | Overcast | 27° /13° | 5.9 mm | 6 | |
| Aug. 11 | Moderate rain at times | 28° /15° | 5 mm | 6 | |
| Aug. 12 |  Sunny | 27° /15° | 3.6 mm | 6 | |
| Aug. 13 | Moderate or heavy rain shower | 26° /14° | 8.1 mm | 6 | |
| Aug. 14 | Light rain shower | 25° /16° | 2.8 mm | 6 | |
| Aug. 15 |  Thundery outbreaks possible | 28° /16° | 0 mm | 6 | |
| Aug. 16 |  Partly cloudy | 31° /17° | 0 mm | 7 | |
| Aug. 17 | Sunny | 28° /16° | 0 mm | 6 | |
| Aug. 18 | Overcast | 29° /16° | 0.7 mm | 6 | |
| Aug. 19 | Patchy rain possible | 31° /17° | 0 mm | 7 | |
| Aug. 20 | Overcast | 25° /17° | 0.2 mm | 6 | |
| Aug. 21 |  Cloudy | 32° /16° | 0.4 mm | 7 | |
| Aug. 22 | Sunny | 32° /19° | 14 mm | 7 | |
| Aug. 23 | Cloudy | 30° /16° | 0.5 mm | 7 | |
| Aug. 24 | Patchy rain possible | 28° /16° | 0.3 mm | 6 | |
| Aug. 25 | Light rain shower | 32° /15° | 1.8 mm | 7 | |
| Aug. 26 | Overcast | 32° /13° | 0 mm | 7 | |
| Aug. 27 |  Fog | 30° /13° | 0 mm | 7 | |
| Aug. 28 | Fog | 31° /13° | 0.2 mm | 7 | |
| Aug. 29 | Sunny | 30° /14° | 0.6 mm | 7 | |
| Aug. 30 | Sunny | 30° /15° | 9 mm | 7 | |
| Aug. 31 | Sunny | 31° /14° | 11.9 mm | 8 | |
| Next | |||||
Important Notice
Our weather forecast for Sioux Falls 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 Sioux Falls forecast closer to your planned date for the most up-to-date weather information.
Change Month
Sioux Falls in August - FAQ
What are the expected maximum and minimum temperatures in Sioux Falls during August?
During August, expect a variety of temperatures with highs around 28° and lows near 16°, suitable for diverse activities and preferences.
How much rainfall should be expected in Sioux Falls during August?
Significant rainfall exceeding 105.9 mm is expected in Sioux Falls during August, occurring over more than 14 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Sioux Falls during August?
The average wind speed in Sioux Falls during August is 22 km/h, suggesting breezy to windy conditions, depending on your activities.
August rainfall patterns in Sioux Falls
Explore the daily rainfall trends and prepare for Sioux Fallss August weather 💧
Typically, Sioux Falls has 14 rainy days in August with a total of 105.9 mm of rainfall.
UV exposure in Sioux Falls during August
Stay informed about UV levels for safe outdoor activities throughout the month of August ☀️
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