Minnehaha County (Sioux Falls)
September
Weather in Minnehaha County, South Dakota for September 2026
Your guide to Minnehaha County weather in September - trends and predictions
Until now, September 2026 in Minnehaha County 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 Minnehaha County predicts a temperature of 15.4 °F, which is cooler than the historical average.
In general, the average temperature in Minnehaha County 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 Minnehaha County 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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Temperatures
Rain 🌧️
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19
Dry days
11
Rainy days
0
Snow days
28°/13°
Temperatures
24 km/h
Avg max wind
61 %
Avg humidity
Minnehaha County Weather September
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Temperatures trend during September in Minnehaha County
See the weather trend as well as the moving average line
September weather in Minnehaha County day by day
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| 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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Important Notice
Our weather forecast for Minnehaha County 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 Minnehaha County forecast closer to your planned date for the most up-to-date weather information.
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Minnehaha County in September - FAQ
What are the expected maximum and minimum temperatures in Minnehaha County 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 Minnehaha County during September?
Moderate rainfall is anticipated in Minnehaha County 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 Minnehaha County during September?
The average wind speed in Minnehaha County during September is 24 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Minnehaha County
Explore the daily rainfall trends and prepare for Minnehaha Countys September weather 💧
Typically, Minnehaha County has 11 rainy days in September with a total of 59.1 mm of rainfall.
UV exposure in Minnehaha County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Where is Minnehaha County?Get accurate weather forecasts for Minnehaha County, located at latitude 43.55 and longitude -96.7. Stay updated with localized weather information tailored for Minnehaha County.
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