S
M
T
W
T
F
S
26
52°
41°
27
61°
40°
28
52°
39°
29
52°
44°
30
55°
46°
1
60°
46°
2
55°
43°
3
52°
36°
4
63°
36°
5
62°
51°
6
62°
55°
7
61°
47°
8
60°
39°
9
58°
40°
10
64°
53°
11
59°
45°
12
58°
39°
13
59°
46°
14
60°
50°
15
56°
44°
16
65°
44°
17
79°
59°
18
70°
54°
19
76°
59°
20
82°
60°
21
67°
49°
22
62°
46°
23
65°
43°
24
56°
50°
25
67°
55°
26
73°
58°
27
75°
59°
28
67°
52°
29
65°
51°
30
54°
43°
31
67°
51°
1
64°
51°
2
64°
54°
3
66°
56°
4
72°
57°
5
70°
57°
6
75°
58°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Hyannis Port
Hyannis Port's May 2026 forecast shows daily high temperatures ranging from 54° to 75°, with overnight lows between 43° and 59°. The average high for May is 67° with an average low of 54°. 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 Hyannis Port. See also: June | July | August.
