S
M
T
W
T
F
S
26
61°
34°
27
61°
43°
28
50°
37°
29
59°
36°
30
68°
37°
1
73°
32°
2
64°
46°
3
52°
46°
4
59°
45°
5
52°
37°
6
50°
34°
7
55°
32°
8
61°
48°
9
50°
39°
10
54°
37°
11
48°
36°
12
59°
37°
13
52°
41°
14
54°
41°
15
52°
37°
16
57°
32°
17
59°
43°
18
59°
39°
19
64°
49°
20
62°
51°
21
68°
55°
22
76°
57°
23
67°
53°
24
67°
54°
25
71°
56°
26
67°
51°
27
62°
50°
28
61°
49°
29
60°
50°
30
62°
48°
31
63°
49°
1
57°
46°
2
57°
45°
3
61°
48°
4
60°
51°
5
61°
51°
6
63°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Castleton
Castleton's May 2026 forecast shows daily high temperatures ranging from 57° to 76°, with overnight lows between 45° and 57°. The average high for May is 64° 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 Castleton. See also: June | July | August.
