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7 Days
14 Days
Weekend
Monthly
Precipitation
Temperature
Wind
Temperature Unit Selection
°Celsius
°Fahrenheit
Monthly Historical Averages
Sioux City, IA
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September
Average Temperature
High
24°
Feels 25
Low
12°
Feels 11
Average Precipitation
8 Days
Rain amount
77.6mm
Snow amount
0.1cm
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Daily Historical Averages
September 2026
S
M
T
W
T
F
S
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
22°
20
19°
21
17°
22
18°
23
18°
24
18°
25
20°
26
20°
27
21°
28
21°
29
20°
30
20°
Forecast
Saturday, September 19, 2026
Day
22°
Feels 22
Wind
16 km/h N
Gust
24 km/h
Humidity
78%
P.O.P
40%
Rain
~1 mm
Night
16°
Feels 15
Wind
18 km/h N
Gust
27 km/h
Humidity
94%
P.O.P
40%
Rain
<1 mm
Historical Averages
Sep 19
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity
Historical Averages are based on data recorded from 2000 onwards.