Sioux City weather by month

Check out Sioux City weather averages by month. Compare detailed monthly climate statistics including temperature, rainfall and sunshine figures.

Temperature
Rainfall
Sunshine & UV index

Temperature in Sioux City (°C)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Max temperature (daytime)	-2	1	8	17	23	28	31	29	24	18	8	-1
Min temperature (night-time)	-14	-10	-4	3	10	15	18	16	11	4	-3	-11
Heat & Humidity	0	0	0	0	0	M	H	M	0	0	0	0

Note: 0 = None, L = Low, M = Moderate, H = High, VH = Very high, E = Extreme

Sunshine & UV index in Sioux City

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Daily hours of sunshine	6	6	7	8	9	10	11	10	8	7	5	5
Daily hours of daylight	9	11	12	13	15	15	15	14	12	11	10	9
UV Index (Maximum)	1	2	4	6	7	9	9	8	6	4	2	1

Rainfall in Sioux City

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Number of days with some rain	7	6	9	10	11	10	9	9	9	7	6	7
Average monthly rainfall (mm)	14	18	50	60	93	95	83	75	73	49	27	20

More about Sioux City

Sioux City by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

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The climate guide for Iowa (Sioux City) shows long term monthly weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

What's the climate like in Sioux City?

Sioux City has a cold climate with hot summers and some rainfall in all months.

Sioux City weather in January

Expect daytime maximum temperatures of -2°C in Sioux City, Iowa in January based on long-term weather averages. There are 6 hours of sunshine per day on average, which might fall as snow.

-2
-2°C max day temperature
6
6 hours of sunshine per day
7
7 days with some rainfall
-14
-14°C min night temperature
9
9 hours of daylight per day
0
No heat & humidity
14
14 mm of monthly rainfall
1
1 (Low) UV index

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Sioux City weather in February

Expect daytime maximum temperatures of 1°C in Sioux City, Iowa in February based on long-term weather averages. There are 6 hours of sunshine per day on average, which might fall as snow.

1
1°C max day temperature
6
6 hours of sunshine per day
6
6 days with some rainfall
-10
-10°C min night temperature
11
11 hours of daylight per day
0
No heat & humidity
18
18 mm of monthly rainfall
2
2 (Low) UV index

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Sioux City weather in March

Expect daytime maximum temperatures of 8°C in Sioux City, Iowa in March based on long-term weather averages. There are 7 hours of sunshine per day on average with typically 50 mm of rainfall in the month.

8
8°C max day temperature
7
7 hours of sunshine per day
9
9 days with some rainfall
-4
-4°C min night temperature
12
12 hours of daylight per day
0
No heat & humidity
50
50 mm of monthly rainfall
4
4 (Moderate) UV index

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Sioux City weather in April

Expect daytime maximum temperatures of 17°C in Sioux City, Iowa in April based on long-term weather averages. There are 8 hours of sunshine per day on average with 10 days with some rainfall and typically 60 mm of rainfall in the month.

17
17°C max day temperature
8
8 hours of sunshine per day
10
10 days with some rainfall
3
3°C min night temperature
13
13 hours of daylight per day
0
No heat & humidity
60
60 mm of monthly rainfall
6
6 (High) UV index

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Sioux City weather in May

Expect daytime maximum temperatures of 23°C in Sioux City, Iowa in May based on long-term weather averages. There are 9 hours of sunshine per day on average with 11 days with some rainfall and typically 93 mm of rainfall in the month.

23
23°C max day temperature
9
9 hours of sunshine per day
11
11 days with some rainfall
10
10°C min night temperature
15
15 hours of daylight per day
0
No heat & humidity
93
93 mm of monthly rainfall
7
7 (High) UV index

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Sioux City weather in June

Expect daytime maximum temperatures of 28°C in Sioux City, Iowa in June based on long-term weather averages. There are 10 hours of sunshine per day on average with 10 days with some rainfall and typically 95 mm of rainfall in the month.

28
28°C max day temperature
10
10 hours of sunshine per day
10
10 days with some rainfall
15
15°C min night temperature
15
15 hours of daylight per day
M
Moderate heat & humidity
95
95 mm of monthly rainfall
9
9 (Very High) UV index

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Sioux City weather in July

Expect daytime maximum temperatures of 31°C in Sioux City, Iowa in July and high heat and humidity based on long-term weather averages. There are 11 hours of sunshine per day on average with typically 83 mm of rainfall in the month.

31
31°C max day temperature
11
11 hours of sunshine per day
9
9 days with some rainfall
18
18°C min night temperature
15
15 hours of daylight per day
H
High heat & humidity
83
83 mm of monthly rainfall
9
9 (Very High) UV index

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Sioux City weather in August

Expect daytime maximum temperatures of 29°C in Sioux City, Iowa in August based on long-term weather averages. There are 10 hours of sunshine per day on average with typically 75 mm of rainfall in the month.

29
29°C max day temperature
10
10 hours of sunshine per day
9
9 days with some rainfall
16
16°C min night temperature
14
14 hours of daylight per day
M
Moderate heat & humidity
75
75 mm of monthly rainfall
8
8 (Very High) UV index

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Sioux City weather in September

Expect daytime maximum temperatures of 24°C in Sioux City, Iowa in September based on long-term weather averages. There are 8 hours of sunshine per day on average with typically 73 mm of rainfall in the month.

24
24°C max day temperature
8
8 hours of sunshine per day
9
9 days with some rainfall
11
11°C min night temperature
12
12 hours of daylight per day
0
No heat & humidity
73
73 mm of monthly rainfall
6
6 (High) UV index

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Sioux City weather in October

Expect daytime maximum temperatures of 18°C in Sioux City, Iowa in October based on long-term weather averages. There are 7 hours of sunshine per day on average with typically 49 mm of rainfall in the month.

18
18°C max day temperature
7
7 hours of sunshine per day
7
7 days with some rainfall
4
4°C min night temperature
11
11 hours of daylight per day
0
No heat & humidity
49
49 mm of monthly rainfall
4
4 (Moderate) UV index

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Sioux City weather in November

Expect daytime maximum temperatures of 8°C in Sioux City, Iowa in November based on long-term weather averages. There are 5 hours of sunshine per day on average.

8
8°C max day temperature
5
5 hours of sunshine per day
6
6 days with some rainfall
-3
-3°C min night temperature
10
10 hours of daylight per day
0
No heat & humidity
27
27 mm of monthly rainfall
2
2 (Low) UV index

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Sioux City weather in December

Expect daytime maximum temperatures of -1°C in Sioux City, Iowa in December based on long-term weather averages. There are 5 hours of sunshine per day on average, which might fall as snow.