S
M
T
W
T
F
S
26
63°
42°
27
59°
43°
28
56°
37°
29
61°
33°
30
56°
37°
1
56°
32°
2
70°
27°
3
74°
43°
4
73°
43°
5
57°
37°
6
60°
29°
7
70°
36°
8
81°
41°
9
72°
42°
10
75°
34°
11
87°
36°
12
80°
53°
13
80°
42°
14
85°
51°
15
95°
51°
16
85°
48°
17
86°
56°
18
57°
50°
19
58°
40°
20
59°
35°
21
69°
49°
22
73°
50°
23
77°
51°
24
83°
59°
25
87°
60°
26
85°
59°
27
79°
59°
28
78°
60°
29
78°
54°
30
75°
51°
31
82°
56°
1
83°
57°
2
81°
55°
3
81°
58°
4
83°
59°
5
79°
54°
6
80°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Regency of Sioux City
Regency of Sioux City's May 2026 forecast shows daily high temperatures ranging from 75° to 87°, with overnight lows between 51° and 61°. The average high for May is 81° with an average low of 57°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Regency of Sioux City. See also: June | July | August.
