S
M
T
W
T
F
S
26
51°
40°
27
55°
40°
28
53°
39°
29
51°
37°
30
50°
38°
1
52°
32°
2
53°
37°
3
62°
42°
4
62°
43°
5
59°
42°
6
61°
34°
7
50°
32°
8
51°
32°
9
54°
37°
10
61°
44°
11
61°
45°
12
66°
46°
13
67°
47°
14
69°
46°
15
66°
45°
16
60°
42°
17
57°
36°
18
59°
45°
19
64°
46°
20
59°
44°
21
59°
43°
22
59°
42°
23
63°
45°
24
71°
40°
25
73°
38°
26
67°
41°
27
68°
46°
28
73°
49°
29
73°
50°
30
75°
50°
31
75°
49°
1
74°
51°
2
76°
52°
3
76°
53°
4
78°
52°
5
75°
41°
6
74°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Custer State Park
Custer State Park's May 2026 forecast shows daily high temperatures ranging from 50° to 78°, with overnight lows between 32° and 53°. The average high for May is 63° with an average low of 43°. 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 Custer State Park. See also: June | July | August.
