S
M
T
W
T
F
S
26
46°
38°
27
47°
38°
28
51°
30°
29
56°
30°
30
52°
32°
1
52°
27°
2
68°
32°
3
70°
41°
4
57°
35°
5
47°
29°
6
52°
32°
7
62°
36°
8
72°
37°
9
59°
38°
10
62°
33°
11
76°
31°
12
72°
51°
13
76°
39°
14
81°
50°
15
86°
49°
16
81°
58°
17
77°
55°
18
65°
46°
19
58°
39°
20
61°
41°
21
63°
45°
22
70°
48°
23
76°
51°
24
75°
51°
25
75°
50°
26
74°
51°
27
72°
52°
28
67°
48°
29
65°
49°
30
67°
49°
31
68°
50°
1
67°
49°
2
69°
57°
3
70°
58°
4
78°
60°
5
80°
59°
6
77°
58°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Sioux Falls Junction
Sioux Falls Junction's May 2026 forecast shows daily high temperatures ranging from 58° to 86°, with overnight lows between 39° and 60°. The average high for May is 72° with an average low of 51°. 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 Sioux Falls Junction. See also: June | July | August.
