September
Weather in South Dakota for September 2025
Your guide to South Dakota weather in September - trends and predictions
In general, the average temperature in South Dakota at the beginning of September is 32.9 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 27.6 °F by the end of September.
South Dakota sees moderate rainfall in September, averaging 8 rainy days.
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22
Dry days
8
Rainy days
0
Snow days
30°/12°
Temperatures
23 km/h
Avg max wind
57 %
Avg humidity
South Dakota in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  33° | 2  37° | 3  37° | 4  39° | 5  30° | 6  26° | 7 28° |
| 8 32° | 9 32° | 10 30° | 11 31° | 12 31° | 13 32° | 14 31° |
| 15 30° | 16 29° | 17 28° | 18 32° | 19 32° | 20 29° | 21 26° |
| 22 21° | 23 22° | 24  24° | 25 27° | 26 25° | 27 27° | 28 30° |
| 29 32° | 30  28° |
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Temperatures trend during September in South Dakota
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 | Partly cloudy | 33° /13° | 0 mm | 8 | |
| Sept. 2 | Mist | 37° /12° | 0 mm | 8 | |
| Sept. 3 | Thundery outbreaks possible | 37° /15° | 0 mm | 9 | |
| Sept. 4 | Sunny | 39° /17° | 0.4 mm | 10 | |
| Sept. 5 | Patchy rain possible | 30° /16° | 0.2 mm | 7 | |
| Sept. 6 | Cloudy | 26° /11° | 0 mm | 6 | |
| Sept. 7 | Sunny | 28° /5° | 0.1 mm | 8 | |
| Sept. 8 | Sunny | 32° /10° | 0 mm | 8 | |
| Sept. 9 | Thundery outbreaks possible | 32° /15° | 2 mm | 8 | |
| Sept. 10 | Fog | 30° /16° | 0.4 mm | 7 | |
| Sept. 11 | Mist | 31° /10° | 0 mm | 8 | |
| Sept. 12 | Thundery outbreaks possible | 31° /11° | 0 mm | 7 | |
| Sept. 13 | Partly cloudy | 32° /13° | 0 mm | 8 | |
| Sept. 14 | Partly cloudy | 31° /11° | 0.1 mm | 8 | |
| Sept. 15 | Fog | 30° /15° | 1.8 mm | 7 | |
| Sept. 16 | Partly cloudy | 29° /13° | 0.2 mm | 7 | |
| Sept. 17 | Sunny | 28° /11° | 0 mm | 7 | |
| Sept. 18 | Sunny | 32° /13° | 1.3 mm | 8 | |
| Sept. 19 | Sunny | 32° /15° | 8.4 mm | 8 | |
| Sept. 20 | Mist | 29° /12° | 0.6 mm | 7 | |
| Sept. 21 | Fog | 26° /13° | 0 mm | 6 | |
| Sept. 22 | Light rain shower | 21° /9° | 4.5 mm | 5 | |
| Sept. 23 | Light rain shower | 22° /10° | 19.6 mm | 6 | |
| Sept. 24 | Light drizzle | 24° /10° | 0.2 mm | 6 | |
| Sept. 25 | Patchy rain possible | 27° /11° | 0 mm | 7 | |
| Sept. 26 | Patchy rain possible | 25° /10° | 0 mm | 6 | |
| Sept. 27 | Patchy rain possible | 27° /12° | 0 mm | 6 | |
| Sept. 28 | Mist | 30° /10° | 0.5 mm | 7 | |
| Sept. 29 | Patchy light drizzle | 32° /14° | 1.2 mm | 8 | |
| Sept. 30 | Overcast | 28° /14° | 0 mm | 7 | |
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Important Notice
Our weather forecast for South Dakota in September 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 South Dakota forecast closer to your planned date for the most up-to-date weather information.
South Dakota in September - FAQ
What are the expected maximum and minimum temperatures in South Dakota during September?
Expect warm days with temperatures around 30°, cooling to mild conditions of 12° after sunset. Perfect for those who enjoy warm weather.
How much rainfall should be expected in South Dakota during September?
Moderate rainfall is anticipated in South Dakota during September, with a total of 58.9 mm spread over approximately 8 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in South Dakota during September?
The average wind speed in South Dakota during September is 23 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in South Dakota
Explore the daily rainfall trends and prepare for South Dakotas September weather 💧
UV exposure in South Dakota during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Provinces in South Dakota
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