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Weather in Sioux Falls for September 2025

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

    Temperatures

  • In general, the average temperature in Sioux Falls 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.

  • Rain 🌧️

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

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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 in September average weather

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Temperatures trend during September in Sioux Falls

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
Partly cloudy
33° /13° 0 mm 8
Sept. 2 Mist
Mist
37° /12° 0 mm 8
Sept. 3 Thundery outbreaks possible
Thundery outbreaks possible
37° /15° 0 mm 9
Sept. 4 Sunny
Sunny
39° /17° 0.4 mm 10
Sept. 5 Patchy rain possible
Patchy rain possible
30° /16° 0.2 mm 7
Sept. 6 Cloudy
Cloudy
26° /11° 0 mm 6
Sept. 7 Sunny
Sunny
28° /5° 0.1 mm 8
Sept. 8 Sunny
Sunny
32° /10° 0 mm 8
Sept. 9 Thundery outbreaks possible
Thundery outbreaks possible
32° /15° 2 mm 8
Sept. 10 Fog
Fog
30° /16° 0.4 mm 7
Sept. 11 Mist
Mist
31° /10° 0 mm 8
Sept. 12 Thundery outbreaks possible
Thundery outbreaks possible
31° /11° 0 mm 7
Sept. 13 Partly cloudy
Partly cloudy
32° /13° 0 mm 8
Sept. 14 Partly cloudy
Partly cloudy
31° /11° 0.1 mm 8
Sept. 15 Fog
Fog
30° /15° 1.8 mm 7
Sept. 16 Partly cloudy
Partly cloudy
29° /13° 0.2 mm 7
Sept. 17 Sunny
Sunny
28° /11° 0 mm 7
Sept. 18 Sunny
Sunny
32° /13° 1.3 mm 8
Sept. 19 Sunny
Sunny
32° /15° 8.4 mm 8
Sept. 20 Mist
Mist
29° /12° 0.6 mm 7
Sept. 21 Fog
Fog
26° /13° 0 mm 6
Sept. 22 Light rain shower
Light rain shower
21° /9° 4.5 mm 5
Sept. 23 Light rain shower
Light rain shower
22° /10° 19.6 mm 6
Sept. 24 Light drizzle
Light drizzle
24° /10° 0.2 mm 6
Sept. 25 Patchy rain possible
Patchy rain possible
27° /11° 0 mm 7
Sept. 26 Patchy rain possible
Patchy rain possible
25° /10° 0 mm 6
Sept. 27 Patchy rain possible
Patchy rain possible
27° /12° 0 mm 6
Sept. 28 Mist
Mist
30° /10° 0.5 mm 7
Sept. 29 Patchy light drizzle
Patchy light drizzle
32° /14° 1.2 mm 8
Sept. 30 Overcast
Overcast
28° /14° 0 mm 7
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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.

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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