South Dakota
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.
- New! Chat with our AI weatherman - it’s amazing and free.
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
Move between months or click on a day
| 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° |
You can click on date
Access South Dakota weather forecasts with a simple click. Select any date for comprehensive insights on temperature, rainfall, and wind conditions.
Temperatures trend during September in South Dakota
See the weather trend as well as the moving average line
September weather day by day
Click on a date for more information
| 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 | |
| Next | |||||
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
Select a province for an accurate weather forecast
Top locations in South Dakota
Select a location for an accurate weather forecast
More Locations Quick links
You are here
Where is South Dakota?Get accurate weather forecasts for South Dakota, located at latitude 43.55 and longitude -96.7. Stay updated with localized weather information tailored for South Dakota.
Found a mistake?
We appreciate your attention to details. Tell us here.