Weather in Sioux Falls, South Dakota for August 2026
Until now, August 2026 in Sioux Falls has been nearly identical to the historical average, with a temperature of 28.4 °F (showing only a slight deviation of 0.4 °F).
The forecast for the upcoming days in Sioux Falls predicts a temperature of 31 °F, which is slightly above the historical average.
In general, the average temperature in Sioux Falls at the beginning of August is 28 °F. As the month progressed, temperatures tended to noticeably warm up, reaching an average of 30.9 °F 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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Sioux Falls Weather August
Temperatures trend during August in Sioux Falls
August weather in Sioux Falls day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Aug. 1 |  Overcast | 28° /15° | 0.1 mm | 7 | |
| Aug. 2 |  Patchy rain possible | 30° /15° | 0.2 mm | 8 | |
| Aug. 3 |  Sunny | 31° /18° | 3.3 mm | 8 | |
| Aug. 4 |  Moderate or heavy rain shower | 29° /17° | 8.2 mm | 8 | |
| Aug. 5 | Moderate or heavy rain shower | 26° /15° | 14.6 mm | 7 | |
| Aug. 6 | Moderate rain at times | 25° /15° | 2.2 mm | 7 | |
| Aug. 7 | Overcast | 27° /16° | 5.4 mm | 7 | |
| Aug. 8 | Overcast | 28° /15° | 0.4 mm | 7 | |
| Aug. 9 |  Heavy rain at times | 27° /15° | 0.6 mm | 7 | |
| Aug. 10 | Sunny | 34° /19° | 0 mm | 5 | |
| Aug. 11 | Sunny | 38° /20° | 7.2 mm | 5.7 | |
| Aug. 12 | Sunny | 30° /18° | 18.3 mm | 6.9 | |
| Aug. 13 |  Partly cloudy | 28° /19° | 1 mm | 3.8 | |
| Aug. 14 | Sunny | 29° /16° | 0.2 mm | 7 | |
| Aug. 15 | Patchy rain possible | 26° /20° | 0.7 mm | 7 | |
| Aug. 16 | Sunny | 28° /14° | 0 mm | 7 | |
| Aug. 17 | Sunny | 28° /17° | 0.9 mm | 7 | |
| Aug. 18 | Sunny | 35° /18° | 6.9 mm | 9 | |
| Aug. 19 | Sunny | 40° /22° | 9.4 mm | 10 | |
| Aug. 20 | Sunny | 24° /16° | 5.4 mm | 5 | |
| Aug. 21 | Sunny | 32° /15° | 0 mm | 8 | |
| Aug. 22 | Partly cloudy | 32° /18° | 0.3 mm | 8 | |
| Aug. 23 | Partly cloudy | 30° /19° | 5.6 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 | |
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Sioux Falls in August - FAQ
What are the expected maximum and minimum temperatures in Sioux Falls during August?
How much rainfall should be expected in Sioux Falls during August?
What are the typical wind conditions in Sioux Falls during August?
August rainfall patterns in Sioux Falls
UV exposure in Sioux Falls during August
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