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°
38°
24
54°
47°
25
66°
49°
26
78°
60°
27
81°
54°
28
65°
49°
29
64°
48°
30
62°
46°
31
67°
46°
1
65°
48°
2
63°
49°
3
72°
52°
4
72°
54°
5
74°
54°
6
71°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in South Harpswell
South Harpswell's May 2026 forecast shows daily high temperatures ranging from 54° to 81°, with overnight lows between 46° and 60°. The average high for May is 68° 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 South Harpswell. See also: June | July | August.
