S
M
T
W
T
F
S
26
26°
18°
27
41°
9°
28
51°
18°
29
59°
22°
30
67°
28°
1
67°
37°
2
66°
43°
3
67°
37°
4
57°
30°
5
55°
28°
6
63°
43°
7
69°
36°
8
61°
39°
9
60°
38°
10
61°
38°
11
63°
37°
12
66°
39°
13
64°
38°
14
62°
37°
15
58°
39°
16
60°
40°
17
64°
42°
18
67°
43°
19
58°
42°
20
57°
43°
21
59°
43°
22
59°
44°
23
60°
43°
24
63°
40°
25
68°
44°
26
69°
45°
27
70°
45°
28
60°
42°
29
59°
39°
30
61°
42°
31
66°
47°
1
61°
46°
2
62°
46°
3
67°
47°
4
64°
47°
5
61°
46°
6
64°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Castor
Castor's May 2026 forecast shows daily high temperatures ranging from 55° to 70°, with overnight lows between 28° and 48°. 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 Castor. See also: June | July | August.
