S
M
T
W
T
F
S
26
58°
47°
27
71°
38°
28
63°
44°
29
62°
55°
30
70°
43°
1
70°
37°
2
63°
48°
3
65°
35°
4
78°
43°
5
85°
53°
6
73°
58°
7
63°
44°
8
74°
38°
9
78°
52°
10
85°
45°
11
61°
43°
12
74°
37°
13
76°
53°
14
64°
47°
15
74°
45°
16
86°
45°
17
90°
58°
18
96°
64°
19
98°
66°
20
94°
59°
21
66°
55°
22
61°
53°
23
72°
60°
24
77°
58°
25
76°
59°
26
78°
56°
27
77°
58°
28
79°
58°
29
77°
57°
30
81°
54°
31
80°
55°
1
81°
59°
2
77°
59°
3
74°
60°
4
78°
59°
5
75°
56°
6
77°
59°
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 61° to 98°, with overnight lows between 53° and 66°. The average high for May is 79° with an average low of 58°. 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.
