Annual mean 10°C · wettest around May · prevailing wind W
Warmest
27.9 °C
Coldest
-5.3 °C
Wettest
46%
Windiest
7.0 m/s
Prevailing
W
5.4 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in South Sioux City over the whole year is 10°C. July is the hottest month, with highs of about 28°C; January is the coldest, with lows of about -8°C. South Sioux City has no sharply defined rainy season: the chance of rain on a given day runs from 31% in February, the driest month, to 47% in May, the wettest. Winds in South Sioux City are highest in April, averaging 5.5 m/s (20 km/h), and lightest in July, at 3.2 m/s (12 km/h). The prevailing wind is from the W. The clearest skies in South Sioux City come in July, when the sky is typically 22% covered; January is the cloudiest month, at 48%.
Month by month South Sioux City climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
-4°C
-8°C
-11°C
35%
48%
4.5 m/s
0
0
1
February
-2°C
-8°C
-8°C
31%
40%
4.5 m/s
0
0
7
March
7°C
-1°C
0°C
42%
45%
5.1 m/s
4
0
22
April
13°C
4°C
7°C
42%
43%
5.5 m/s
17
1
46
May
20°C
12°C
16°C
47%
41%
4.3 m/s
52
13
62
June
27°C
19°C
26°C
44%
24%
4.1 m/s
51
55
25
July
28°C
20°C
29°C
42%
22%
3.2 m/s
40
66
12
August
26°C
18°C
26°C
41%
28%
3.2 m/s
55
54
25
September
24°C
14°C
22°C
37%
27%
3.7 m/s
67
34
49
October
15°C
6°C
10°C
38%
34%
4.1 m/s
30
2
58
November
7°C
-1°C
1°C
36%
36%
4.4 m/s
5
0
25
December
-0°C
-5°C
-7°C
36%
40%
4.5 m/s
0
0
4
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short South Sioux City weather by season
Year round, South Sioux City has days of about -4°C at their warmest in January, its coolest month, and 28°C in July, its warmest; the coolest hours of the day run from -8°C to 20°C through the year, and the average temperature over the year is 10°C around the clock. Rain is most likely around May and least likely around February. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
South Sioux City weather in winterDecember to February
High -2°CLow -7°CRain 34%
Winter in South Sioux City has typical daily highs of about -2°C and lows of about -7°C, with a 34% chance of rain on a given day.
South Sioux City weather in springMarch to May
High 13°CLow 5°CRain 44%
Spring in South Sioux City has typical daily highs of about 13°C and lows of about 5°C, with a 44% chance of rain on a given day.
South Sioux City weather in summerJune to August
High 27°CLow 19°CRain 42%
Summer in South Sioux City has typical daily highs of about 27°C and lows of about 19°C, with a 42% chance of rain on a given day.
South Sioux City weather in autumnSeptember to November
High 15°CLow 6°CRain 37%
Autumn in South Sioux City has typical daily highs of about 15°C and lows of about 6°C, with a 37% chance of rain on a given day.
When is the rainy season in South Sioux City?
South Sioux City has no sharply defined rainy season: the chance of rain on a given day runs from 31% in February, the driest month, to 47% in May, the wettest.
What time of year is South Sioux City windiest?
Winds in South Sioux City are highest in April, averaging 5.5 m/s (20 km/h), and lightest in July, at 3.2 m/s (12 km/h). The prevailing wind is from the W.
What is the average temperature in South Sioux City year round?
The average temperature in South Sioux City over the whole year is 10°C. July is the hottest month, with highs of about 28°C; January is the coldest, with lows of about -8°C.