S
M
T
W
T
F
S
26
57°
38°
27
62°
45°
28
60°
45°
29
49°
38°
30
44°
35°
1
41°
32°
2
53°
26°
3
68°
40°
4
75°
45°
5
55°
37°
6
45°
35°
7
48°
31°
8
64°
34°
9
61°
38°
10
52°
32°
11
52°
37°
12
52°
41°
13
55°
39°
14
56°
44°
15
60°
49°
16
63°
47°
17
66°
49°
18
66°
48°
19
63°
48°
20
64°
52°
21
66°
50°
22
64°
46°
23
65°
51°
24
66°
53°
25
69°
54°
26
70°
54°
27
70°
55°
28
69°
54°
29
70°
54°
30
63°
53°
31
62°
50°
1
61°
50°
2
61°
54°
3
63°
55°
4
69°
55°
5
69°
54°
6
65°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Casco
Casco's May 2026 forecast shows daily high temperatures ranging from 52° to 70°, with overnight lows between 32° and 55°. The average high for May is 63° 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 Casco. See also: June | July | August.
