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Sioux City (IA)
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United States weather

Weather in Sioux City, Iowa for September 2026

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

    Temperatures

  • So far, September 2026 in Sioux City shows a warmer trend than usual by 2.6 °F.

  • The forecast for the next days in Sioux City predicts a temperature of 24 °F, which is cooler than the historical average.

  • In general, the average temperature in Sioux City at the beginning of September is 28.1 °F. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 25.7 °F by the end of September.

    • Rain 🌧️

  • Sioux City experiences moderate rainfall in September, with an average of 6 rainy days and a total precipitation of 56 mm.

    • More

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

Average dry days
24
Dry days
Average rainy days
6
Rainy days
Average snowy days
0
Snow days
Average temperatures
26°/13°
Temperatures
Average wind speed
22 km/h
Avg max wind
Average humidity
76 %
Avg humidity

Sioux City Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Moderate or heavy rain shower
28°
2
Fog
31°
3
Heavy rain at times
27°
4
Overcast
29°
5
Sunny
29°
6
Sunny
26°
7
Fog
27°
8
Overcast
30°
9
Thundery outbreaks possible
27°
10
Mist
29°
11
Overcast
30°
12
Partly cloudy
28°
13
Mist
29°
14
Overcast
28°
15
Fog
28°
16
Overcast
19°
17
Fog
25°
18
Sunny
34°
19
Overcast
23°
20
Overcast
17°
21
Patchy rain possible
16°
22
Sunny
23°
23
Patchy rain possible
24°
24
Sunny
19°
25
Sunny
24°
26
Sunny
28°
27
Overcast
32°
28
Sunny
32°
29
Sunny
20°
30
Mist
25°

Temperatures trend during September in Sioux City

See the weather trend as well as the moving average line

September weather in Sioux City day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Moderate or heavy rain shower
Moderate or heavy rain shower
 28° /17° 4.9 mm 4
Sept. 2 Fog
Fog
 31° /16° 0.6 mm 5
Sept. 3 Heavy rain at times
Heavy rain at times
 27° /16° 2.1 mm 6
Sept. 4 Overcast
Overcast
 29° /14° 0 mm 6
Sept. 5 Sunny
Sunny
 29° /15° 0.4 mm 7
Sept. 6 Sunny
Sunny
 26° /11° 87.1 mm 4
Sept. 7 Fog
Fog
 27° /11° 4 mm 3
Sept. 8 Overcast
Overcast
 30° /17° 12.9 mm 4
Sept. 9 Thundery outbreaks possible
Thundery outbreaks possible
 27° /16° 0 mm 7
Sept. 10 Mist
Mist
 29° /14° 0 mm 7
Sept. 11 Overcast
Overcast
 30° /17° 0.2 mm 6
Sept. 12 Partly cloudy
Partly cloudy
 28° /17° 0 mm 7
Sept. 13 Mist
Mist
 29° /14° 1.2 mm 7
Sept. 14 Overcast
Overcast
 28° /15° 13 mm 4
Sept. 15 Fog
Fog
 28° /15° 2.2 mm 4
Sept. 16 Overcast
Overcast
 19° /14° 1.3 mm 1.4
Sept. 17 Fog
Fog
 25° /19° 4.5 mm 5.7
Sept. 18 Sunny
Sunny
 34° /20° 7 mm 4.4
Sept. 19 Overcast
Overcast
 23° /15° 2.9 mm 2
Sept. 20 Overcast
Overcast
 17° /13° 0.7 mm 4
Sept. 21 Patchy rain possible
Patchy rain possible
 16° /13° 2.3 mm 3
Sept. 22 Sunny
Sunny
 23° /12° 0.1 mm 6
Sept. 23 Patchy rain possible
Patchy rain possible
 24° /16° 2.2 mm 6
Sept. 24 Sunny
Sunny
 19° /11° 0 mm 5
Sept. 25 Sunny
Sunny
 24° /11° 0 mm 6
Sept. 26 Sunny
Sunny
 28° /16° 0 mm 7
Sept. 27 Overcast
Overcast
 32° /21° 0 mm 8
Sept. 28 Sunny
Sunny
 32° /18° 0 mm 8
Sept. 29 Sunny
Sunny
 20° /9° 0 mm 5
Sept. 30 Mist
Mist
 25° /16° 0 mm 6
Next
Important Notice
Our weather forecast for Sioux City 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 City forecast closer to your planned date for the most up-to-date weather information.
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Sioux City in September - FAQ

What are the expected maximum and minimum temperatures in Sioux City during September?
Enjoy moderate daytime temperatures of up to 26° and cooler nights around 13°. Ideal for a range of outdoor activities, from hiking to city tours.

How much rainfall should be expected in Sioux City during September?
Moderate rainfall is anticipated in Sioux City during September, with a total of 56 mm spread over approximately 6 days. Considering plans for rainy days is advisable.

What are the typical wind conditions in Sioux City during September?
The average wind speed in Sioux City during September is 22 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Sioux City

Explore the daily rainfall trends and prepare for Sioux Citys September weather 💧
Typically, Sioux City has 6 rainy days in September with a total of 56 mm of rainfall.

UV exposure in Sioux City during September

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

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Get accurate weather forecasts for Sioux City, located at latitude 42.5 and longitude -96.4. Stay updated with localized weather information tailored for Sioux City.

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