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United States weather

Weather in Sioux Falls, South Dakota for September 2025

Your guide to Sioux Falls weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Sioux Falls has been significantly cooler than historical averages by -5.9 °F, with average temperature of 23.6 °F.

  • The forecast for the next days in Sioux Falls predicts a temperature of 25.3 °F, which is cooler than the historical average.

  • In general, the average temperature in Sioux Falls at the beginning of September is 28.7 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 25.1 °F by the end of September.

    • Rain 🌧️

  • Sioux Falls experiences moderate rainfall in September, with an average of 7 rainy days and a total precipitation of 41.1 mm.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
23
Dry days
Average rainy days
7
Rainy days
Average snowy days
0
Snow days
Average temperatures
29°/12°
Temperatures
Average wind speed
24 km/h
Avg max wind
Average humidity
54 %
Avg humidity

Sioux Falls Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Partly cloudy
28°
2
Mist
33°
3
Thundery outbreaks possible
31°
4
Sunny
33°
5
Patchy rain possible
27°
6
Cloudy
23°
7
Sunny
26°
8
Sunny
31°
9
Thundery outbreaks possible
30°
10
Fog
30°
11
Mist
29°
12
Thundery outbreaks possible
30°
13
Partly cloudy
33°
14
Partly cloudy
30°
15
Fog
30°
16
Sunny
33°
17
Heavy rain
26°
18
Heavy rain
21°
19
Moderate rain
23°
20
Patchy rain possible
25°
21
Fog
28°
22
Moderate rain
23°
23
Sunny
27°
24
Sunny
29°
25
Sunny
24°
26
Sunny
26°
27
Sunny
29°
28
Patchy rain possible
22°
29
Patchy rain possible
18°
30
Overcast
28°

Temperatures trend during September in Sioux Falls

See the weather trend as well as the moving average line

September weather in Sioux Falls day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Partly cloudy
Partly cloudy
 28° /14° 16 mm 7
Sept. 2 Mist
Mist
 33° /13° 0 mm 7
Sept. 3 Thundery outbreaks possible
Thundery outbreaks possible
 31° /13° 0.5 mm 7
Sept. 4 Sunny
Sunny
 33° /12° 2.5 mm 8
Sept. 5 Patchy rain possible
Patchy rain possible
 27° /12° 0.9 mm 7
Sept. 6 Cloudy
Cloudy
 23° /9° 0 mm 5
Sept. 7 Sunny
Sunny
 26° /4° 0.1 mm 7
Sept. 8 Sunny
Sunny
 31° /10° 0 mm 7
Sept. 9 Thundery outbreaks possible
Thundery outbreaks possible
 30° /16° 1.3 mm 7
Sept. 10 Fog
Fog
 30° /16° 0.2 mm 6
Sept. 11 Mist
Mist
 29° /11° 0 mm 7
Sept. 12 Thundery outbreaks possible
Thundery outbreaks possible
 30° /13° 0 mm 7
Sept. 13 Partly cloudy
Partly cloudy
 33° /15° 0 mm 8
Sept. 14 Partly cloudy
Partly cloudy
 30° /13° 0.3 mm 7
Sept. 15 Fog
Fog
 30° /15° 1.2 mm 7
Sept. 16 Sunny
Sunny
 33° /16° 0 mm 1.4
Sept. 17 Heavy rain
Heavy rain
 26° /17° 21.1 mm 1.1
Sept. 18 Heavy rain
Heavy rain
 21° /18° 26.1 mm 0.9
Sept. 19 Moderate rain
Moderate rain
 23° /16° 17.6 mm 0.7
Sept. 20 Patchy rain possible
Patchy rain possible
 25° /14° 0.2 mm 0
Sept. 21 Fog
Fog
 28° /15° 0 mm 5
Sept. 22 Moderate rain
Moderate rain
 23° /15° 5.7 mm 4
Sept. 23 Sunny
Sunny
 27° /12° 0 mm 5
Sept. 24 Sunny
Sunny
 29° /14° 0 mm 6
Sept. 25 Sunny
Sunny
 24° /12° 0 mm 5
Sept. 26 Sunny
Sunny
 26° /11° 0 mm 5
Sept. 27 Sunny
Sunny
 29° /17° 0 mm 6
Sept. 28 Patchy rain possible
Patchy rain possible
 22° /12° 2.9 mm 4
Sept. 29 Patchy rain possible
Patchy rain possible
 18° /11° 4 mm 3
Sept. 30 Overcast
Overcast
 28° /14° 0 mm 7
Next
Important Notice
Our weather forecast for Sioux Falls 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 Sioux Falls forecast closer to your planned date for the most up-to-date weather information.
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Sioux Falls in September - FAQ

What are the expected maximum and minimum temperatures in Sioux Falls during September?
Enjoy moderate daytime temperatures of up to 29° and cooler nights around 12°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Sioux Falls during September?
In September, Sioux Falls can expect light to moderate rainfall, totaling 41.1 mm across approximately 7 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Sioux Falls during September?
The average wind speed in Sioux Falls during September is 24 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Sioux Falls

Explore the daily rainfall trends and prepare for Sioux Fallss September weather 💧

UV exposure in Sioux Falls during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

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Location coordinates Where is Sioux Falls?

Get accurate weather forecasts for Sioux Falls, located at latitude 43.55 and longitude -96.7. Stay updated with localized weather information tailored for Sioux Falls.

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