Weather in Sioux City: September
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Average day temperature: | 78.9°F |
| Average night temperature: | 60.3°F | |
 |
Number of sunny days: | 17 days |
| Day length: | 11.8 - 13.1 hours | |
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Number of rainy days: | 1 day |
| Precipitation totals: | 0.6 in. | |
| more information | ||
14 days
forecast
forecast
| Sioux City |
weather in
October
October
| Sioux City |
Air temperature in September, °F
Show year:
2026
2025
2024
The highest day temperature during September of 2026 was 97°F. At the same time the lowest night temperature was 51°F. Daily and nightly averages during September were 74.2°F and 63.3°F.
Sunny, partly cloudy and cloudy days
Mostly all days in September are sunny but cloudy days are also possible.
Precipitation total in September, in.
Precipitation total value in Sioux City in September is 0.6 in. Other months of the year show relatively similar values.
Wind speed in September, mph
The average wind speed value in September is 10.0 mph
Average sunny hours
This chart shows average number of hours during the day when sunlight can reach the ground. It depends on day length and cloudiness during the day. The average number of sunny hours in September is: 8.4.
Best time for vacation in Sioux City
Sioux City on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Sioux City
Local time: 11:46
October 29, thursday
1200
61°F
W
6 mph
6 mph
1500
64°F
W
7 mph
7 mph
1800
59°F
W
7 mph
7 mph
2100
52°F
W
7 mph
7 mph
October 30, friday
0000
50°F
W
7 mph
7 mph
0300
54°F
W
9 mph
9 mph
0600
54°F
W
10 mph
10 mph
0900
54°F
W
12 mph
12 mph
