Sioux Falls
August
Weather in Sioux Falls for August 2025
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 28.3 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 34 °F by the end of August.
Sioux Falls sees moderate rainfall in August, averaging 9 rainy days.
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22
Dry days
9
Rainy days
0
Snow days
31°/16°
Temperatures
22 km/h
Avg max wind
60 %
Avg humidity
Sioux Falls in August average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  29° | 2  31° | 3 32° | ||||
| 4 32° | 5  27° | 6 22° | 7 25° | 8 24° | 9  25° | 10 27° |
| 11 26° | 12  26° | 13 24° | 14 22° | 15 27° | 16  30° | 17 25° |
| 18 28° | 19 32° | 20 25° | 21  33° | 22 35° | 23 35° | 24 31° |
| 25 38° | 26 35° | 27 31° | 28  34° | 29 32° | 30 32° | 31 36° |
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Temperatures trend during August in Sioux Falls
See the weather trend as well as the moving average line
August weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Aug. 1 | Overcast | 29° /17° | 0.1 mm | 7 | |
| Aug. 2 | Patchy rain possible | 31° /17° | 0.4 mm | 8 | |
| Aug. 3 | Overcast | 32° /18° | 0 mm | 8 | |
| Aug. 4 | Overcast | 32° /18° | 0 mm | 8 | |
| Aug. 5 | Moderate or heavy rain shower | 27° /16° | 22.8 mm | 6 | |
| Aug. 6 | Moderate rain at times | 22° /16° | 4.4 mm | 5 | |
| Aug. 7 | Overcast | 25° /13° | 0.9 mm | 6 | |
| Aug. 8 | Overcast | 24° /13° | 0 mm | 6 | |
| Aug. 9 | Heavy rain at times | 25° /12° | 1 mm | 6 | |
| Aug. 10 | Overcast | 27° /12° | 8.8 mm | 7 | |
| Aug. 11 | Moderate rain at times | 26° /15° | 7.5 mm | 6 | |
| Aug. 12 | Sunny | 26° /14° | 5.4 mm | 7 | |
| Aug. 13 | Moderate or heavy rain shower | 24° /14° | 12.2 mm | 6 | |
| Aug. 14 | Moderate or heavy rain shower | 22° /15° | 3.1 mm | 5 | |
| Aug. 15 | Overcast | 27° /14° | 0 mm | 6 | |
| Aug. 16 | Partly cloudy | 30° /15° | 0 mm | 7 | |
| Aug. 17 | Sunny | 25° /14° | 0 mm | 6 | |
| Aug. 18 | Overcast | 28° /13° | 0 mm | 6 | |
| Aug. 19 | Patchy rain possible | 32° /17° | 0.1 mm | 8 | |
| Aug. 20 | Overcast | 25° /17° | 0.2 mm | 6 | |
| Aug. 21 | Cloudy | 33° /16° | 0.6 mm | 7 | |
| Aug. 22 | Sunny | 35° /19° | 1.3 mm | 9 | |
| Aug. 23 | Partly cloudy | 35° /19° | 0.7 mm | 8 | |
| Aug. 24 | Patchy rain possible | 31° /20° | 0.4 mm | 7 | |
| Aug. 25 | Light rain shower | 38° /19° | 2.7 mm | 8 | |
| Aug. 26 | Overcast | 35° /18° | 0 mm | 8 | |
| Aug. 27 | Sunny | 31° /13° | 0 mm | 7 | |
| Aug. 28 | Mist | 34° /14° | 0.3 mm | 8 | |
| Aug. 29 | Sunny | 32° /14° | 0.9 mm | 8 | |
| Aug. 30 | Sunny | 32° /15° | 0 mm | 8 | |
| Aug. 31 | Sunny | 36° /14° | 0 mm | 9 | |
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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.
Sioux Falls in August - FAQ
What are the expected maximum and minimum temperatures in Sioux Falls during August?
Expect warm days with temperatures around 31°, cooling to mild conditions of 16° after sunset. Perfect for those who enjoy warm weather.
How much rainfall should be expected in Sioux Falls during August?
Significant rainfall exceeding 115.6 mm is expected in Sioux Falls during August, occurring over more than 9 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.
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