S
M
T
W
T
F
S
26
64°
30°
27
66°
32°
28
59°
32°
29
50°
43°
30
46°
43°
1
59°
36°
2
50°
33°
3
52°
37°
4
69°
35°
5
65°
46°
6
59°
50°
7
64°
39°
8
58°
36°
9
58°
34°
10
61°
48°
11
62°
40°
12
59°
37°
13
52°
34°
14
64°
46°
15
62°
48°
16
70°
47°
17
83°
54°
18
66°
47°
19
86°
48°
20
89°
63°
21
66°
46°
22
65°
35°
23
68°
47°
24
54°
49°
25
65°
49°
26
76°
58°
27
80°
54°
28
70°
50°
29
63°
48°
30
61°
47°
31
66°
50°
1
67°
50°
2
66°
48°
3
67°
53°
4
72°
51°
5
69°
50°
6
66°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Harpswell
Harpswell's May 2026 forecast shows daily high temperatures ranging from 54° to 80°, with overnight lows between 47° and 58°. The average high for May is 67° with an average low of 50°. 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 Harpswell. See also: June | July | August.
