S
M
T
W
T
F
S
26
64°
39°
27
63°
48°
28
57°
45°
29
63°
43°
30
70°
46°
1
68°
43°
2
63°
45°
3
55°
50°
4
55°
43°
5
54°
37°
6
54°
43°
7
59°
39°
8
63°
43°
9
61°
46°
10
55°
41°
11
54°
37°
12
54°
36°
13
54°
43°
14
55°
41°
15
54°
43°
16
52°
41°
17
57°
45°
18
57°
45°
19
61°
50°
20
N/A
21
60°
52°
22
64°
48°
23
62°
51°
24
67°
59°
25
69°
53°
26
63°
48°
27
61°
48°
28
66°
50°
29
63°
49°
30
63°
50°
31
62°
50°
1
59°
48°
2
60°
49°
3
52°
46°
4
53°
45°
5
53°
46°
6
54°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
May Weather in Castleton
Castleton's May 2026 forecast shows daily high temperatures ranging from 52° to 69°, with overnight lows between 45° and 59°. The average high for May is 61° with an average low of 49°. 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.
