S
M
T
W
T
F
S
26
64°
35°
27
73°
37°
28
71°
43°
29
69°
46°
30
52°
42°
1
57°
40°
2
51°
35°
3
51°
36°
4
69°
47°
5
79°
51°
6
59°
42°
7
55°
37°
8
54°
32°
9
51°
32°
10
65°
48°
11
56°
34°
12
56°
32°
13
54°
41°
14
54°
47°
15
62°
48°
16
75°
47°
17
81°
57°
18
89°
67°
19
89°
68°
20
78°
41°
21
60°
34°
22
67°
42°
23
66°
52°
24
69°
53°
25
71°
52°
26
72°
54°
27
74°
55°
28
75°
55°
29
74°
56°
30
75°
55°
31
76°
51°
1
72°
53°
2
71°
54°
3
70°
53°
4
69°
56°
5
72°
56°
6
76°
55°
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 60° to 89°, with overnight lows between 34° and 68°. The average high for May is 73° with an average low of 53°. 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.
