S
M
T
W
T
F
S
29
75°
36°
30
84°
40°
31
59°
36°
1
52°
31°
2
42°
37°
3
39°
35°
4
46°
33°
5
66°
29°
6
44°
34°
7
48°
31°
8
65°
37°
9
53°
26°
10
60°
29°
11
65°
44°
12
85°
56°
13
89°
53°
14
78°
44°
15
70°
41°
16
85°
52°
17
61°
30°
18
54°
30°
19
67°
35°
20
76°
48°
21
81°
49°
22
80°
53°
23
69°
47°
24
64°
40°
25
64°
40°
26
63°
37°
27
66°
40°
28
65°
39°
29
59°
46°
30
64°
44°
1
61°
42°
2
60°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
April Weather in South Sioux City
South Sioux City's April 2026 forecast shows daily high temperatures ranging from 54° to 85°, with overnight lows between 30° and 53°. The average high for April is 67° with an average low of 42°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how April weather will actually feel in South Sioux City. See also: May | June | July.
