S
M
T
W
T
F
S
26
54°
43°
27
54°
45°
28
55°
45°
29
56°
43°
30
57°
43°
1
55°
41°
2
56°
39°
3
54°
41°
4
54°
40°
5
56°
42°
6
56°
44°
7
57°
45°
8
58°
48°
9
59°
44°
10
58°
43°
11
58°
45°
12
59°
46°
13
60°
50°
14
62°
46°
15
58°
46°
16
59°
48°
17
63°
49°
18
61°
47°
19
60°
48°
20
61°
53°
21
66°
53°
22
63°
52°
23
62°
50°
24
62°
51°
25
65°
53°
26
69°
55°
27
71°
52°
28
72°
49°
29
67°
47°
30
65°
52°
31
66°
51°
1
65°
52°
2
67°
52°
3
72°
49°
4
67°
50°
5
67°
54°
6
73°
57°
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 73°, with overnight lows between 39° and 57°. The average high for May is 61° with an average low of 48°. 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.
