South Dakota (Sioux Falls)
September
Weather in South Dakota for September 2026
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 28.7 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 27.4 °C by the end of September.
The climate of South Dakota in September is notably wet, with an average of 11 rainy days, and a total of 59.1 mm of precipitation.
New! Chat with our AI weatherman - it’s amazing and free.
Temperatures
Rain 🌧️
More
19
Dry days
11
Rainy days
0
Snow days
28°/13°
Temperatures
24 km/h
Avg max wind
61 %
Avg humidity
South Dakota Weather September
Move between months or click on a day
What’s the Weather Like in South Dakota This September?
Discover the average temperatures and weather trends across South Dakota’s cities this September.
Temperatures trend during September in South Dakota
See the weather trend as well as the moving average line
September weather in South Dakota day by day
Click on a date for more information
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Partly cloudy | 28° /14° | 16 mm | 7 | |
| Sept. 2 |  Mist | 33° /13° | 0 mm | 7 | |
| Sept. 3 |  Thundery outbreaks possible | 31° /13° | 0.5 mm | 7 | |
| Sept. 4 |  Sunny | 33° /12° | 2.5 mm | 8 | |
| Sept. 5 |  Patchy rain possible | 27° /12° | 0.9 mm | 7 | |
| Sept. 6 |  Cloudy | 23° /9° | 0 mm | 5 | |
| Sept. 7 | Sunny | 26° /4° | 0.1 mm | 7 | |
| Sept. 8 | Sunny | 31° /10° | 0 mm | 7 | |
| Sept. 9 | Thundery outbreaks possible | 30° /16° | 1.3 mm | 7 | |
| Sept. 10 | Fog | 30° /16° | 0.2 mm | 6 | |
| Sept. 11 | Mist | 29° /11° | 0 mm | 7 | |
| Sept. 12 | Thundery outbreaks possible | 30° /13° | 0 mm | 7 | |
| Sept. 13 | Partly cloudy | 33° /15° | 0 mm | 8 | |
| Sept. 14 | Partly cloudy | 30° /13° | 0.3 mm | 7 | |
| Sept. 15 | Fog | 30° /15° | 1.2 mm | 7 | |
| Sept. 16 | Partly cloudy | 31° /14° | 0.1 mm | 7 | |
| Sept. 17 | Thundery outbreaks possible | 27° /13° | 5.1 mm | 6 | |
| Sept. 18 | Sunny | 29° /14° | 5.1 mm | 7 | |
| Sept. 19 |  Overcast | 29° /14° | 5.6 mm | 7 | |
| Sept. 20 | Mist | 27° /12° | 0.4 mm | 6 | |
| Sept. 21 | Fog | 26° /12° | 0 mm | 6 | |
| Sept. 22 | Light rain shower | 24° /11° | 4 mm | 5 | |
| Sept. 23 | Light rain shower | 23° /10° | 13.1 mm | 5 | |
| Sept. 24 |  Light drizzle | 24° /11° | 1.7 mm | 5 | |
| Sept. 25 | Patchy rain possible | 27° /11° | 0 mm | 6 | |
| Sept. 26 | Sunny | 27° /10° | 0 mm | 7 | |
| Sept. 27 | Patchy rain possible | 26° /12° | 0 mm | 6 | |
| Sept. 28 | Sunny | 29° /9° | 0.3 mm | 7 | |
| Sept. 29 | Patchy light drizzle | 32° /13° | 0.8 mm | 7 | |
| Sept. 30 | Overcast | 27° /15° | 0 mm | 6 | |
| 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.
Change Month
South Dakota in September - FAQ
What are the expected maximum and minimum temperatures in South Dakota during September?
Enjoy moderate daytime temperatures of up to 28° and cooler nights around 13°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in South Dakota during September?
Moderate rainfall is anticipated in South Dakota during September, with a total of 59.1 mm spread over approximately 11 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 24 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 💧
Typically, South Dakota has 11 rainy days in September with a total of 59.1 mm of rainfall.
UV exposure in South Dakota during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Counties in South Dakota
Select a county for an accurate weather forecast
Top locations in South Dakota
Select a location for an accurate weather forecast
More Locations Quick links
More South Dakota weather pages
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.