Weather in Sioux Falls, South Dakota for September 2026
Until now, September 2026 in Sioux Falls is cooler than usual, with temperatures averaging 24.1 °F, this is 3.3 °F below the typical seasonal average.
The forecast for the next days in Sioux Falls predicts a temperature of 15.4 °F, which is cooler than the historical average.
In general, the average temperature in Sioux Falls at the beginning of September is 29.6 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 20.7 °F by the end of September.
The climate of Sioux Falls in September is notably wet, with an average of 11 rainy days, and a total of 59.1 mm of precipitation.
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Sioux Falls Weather September
Temperatures trend during September in Sioux Falls
September weather in Sioux Falls day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Partly cloudy | 28° /14° | 22.5 mm | 5 | |
| Sept. 2 |  Sunny | 33° /14° | 1.3 mm | 7 | |
| Sept. 3 |  Thundery outbreaks possible | 32° /15° | 0.4 mm | 7 | |
| Sept. 4 | Sunny | 34° /14° | 1.9 mm | 8 | |
| Sept. 5 |  Patchy rain possible | 28° /14° | 103.7 mm | 6 | |
| Sept. 6 |  Cloudy | 25° /11° | 3.7 mm | 4 | |
| Sept. 7 | Sunny | 27° /8° | 0.1 mm | 6 | |
| Sept. 8 | Sunny | 30° /12° | 16.9 mm | 6 | |
| Sept. 9 | Thundery outbreaks possible | 29° /15° | 1 mm | 7 | |
| Sept. 10 |  Fog | 29° /15° | 0.2 mm | 6 | |
| Sept. 11 | Mist | 29° /13° | 0 mm | 7 | |
| Sept. 12 | Thundery outbreaks possible | 28° /13° | 0 mm | 7 | |
| Sept. 13 | Partly cloudy | 30° /14° | 0 mm | 7 | |
| Sept. 14 | Partly cloudy | 29° /13° | 3.8 mm | 6 | |
| Sept. 15 | Fog | 28° /14° | 0.9 mm | 6 | |
| Sept. 16 | Partly cloudy | 28° /13° | 0.5 mm | 6 | |
| Sept. 17 | Thundery outbreaks possible | 25° /14° | 3.8 mm | 5 | |
| Sept. 18 | Sunny | 27° /14° | 13.3 mm | 5 | |
| Sept. 19 |  Overcast | 26° /14° | 4.2 mm | 5 | |
| Sept. 20 | Mist | 24° /12° | 3.2 mm | 5 | |
| Sept. 21 | Fog | 22° /12° | 3 mm | 5 | |
| Sept. 22 | Light rain shower | 22° /10° | 3.1 mm | 4 | |
| Sept. 23 | Light rain shower | 22° /10° | 9.9 mm | 5 | |
| Sept. 24 |  Light drizzle | 22° /11° | 4.1 mm | 4 | |
| Sept. 25 | Patchy rain possible | 24° /12° | 0.9 mm | 5 | |
| Sept. 26 | Patchy rain possible | 16° /13° | 21.5 mm | 1.7 | |
| Sept. 27 | Fog | 22° /14° | 0.1 mm | 5 | |
| Sept. 28 | Overcast | 22° /14° | 0 mm | 5.1 | |
| Sept. 29 | Overcast | 20° /16° | 3 mm | 2.6 | |
| Sept. 30 | Overcast | 19° /14° | 0 mm | 4 | |
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Sioux Falls in September - FAQ
What are the expected maximum and minimum temperatures in Sioux Falls during September?
How much rainfall should be expected in Sioux Falls during September?
What are the typical wind conditions in Sioux Falls during September?
September rainfall patterns in Sioux Falls
UV exposure in Sioux Falls during September
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