S
M
T
W
T
F
S
26
47°
31°
27
50°
30°
28
61°
36°
29
53°
34°
30
55°
35°
1
60°
34°
2
64°
39°
3
62°
35°
4
55°
37°
5
57°
40°
6
62°
41°
7
56°
35°
8
54°
35°
9
56°
33°
10
61°
35°
11
56°
34°
12
56°
34°
13
58°
35°
14
64°
42°
15
67°
45°
16
70°
42°
17
61°
38°
18
59°
36°
19
63°
43°
20
72°
47°
21
73°
48°
22
74°
50°
23
74°
48°
24
67°
45°
25
66°
49°
26
71°
50°
27
65°
50°
28
66°
49°
29
65°
50°
30
66°
49°
31
68°
49°
1
70°
42°
2
68°
42°
3
68°
44°
4
71°
49°
5
72°
50°
6
71°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Casper
Casper's May 2026 forecast shows daily high temperatures ranging from 47° to 74°, with overnight lows between 30° and 51°. The average high for May is 63° with an average low of 41°. 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 Casper. See also: June | July | August.
