S
M
T
W
T
F
S
26
69°
42°
27
69°
51°
28
63°
48°
29
53°
35°
30
53°
31°
1
50°
31°
2
60°
28°
3
70°
46°
4
76°
42°
5
56°
36°
6
51°
38°
7
56°
40°
8
64°
42°
9
66°
45°
10
58°
39°
11
59°
40°
12
64°
46°
13
65°
47°
14
63°
45°
15
68°
49°
16
68°
50°
17
69°
47°
18
67°
51°
19
70°
52°
20
70°
52°
21
68°
43°
22
63°
43°
23
64°
44°
24
65°
44°
25
65°
45°
26
66°
45°
27
65°
46°
28
66°
46°
29
67°
51°
30
68°
56°
31
73°
51°
1
70°
53°
2
73°
57°
3
76°
57°
4
78°
56°
5
78°
58°
6
77°
59°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Sun Prairie
Sun Prairie's May 2026 forecast shows daily high temperatures ranging from 51° to 78°, with overnight lows between 36° and 59°. The average high for May is 67° with an average low of 48°. 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 Sun Prairie. See also: June | July | August.
