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
58°
44°
9
58°
51°
10
65°
52°
11
56°
47°
12
58°
45°
13
61°
50°
14
60°
48°
15
62°
47°
16
63°
51°
17
67°
50°
18
66°
50°
19
68°
51°
20
67°
52°
21
70°
50°
22
61°
49°
23
61°
49°
24
62°
54°
25
64°
54°
26
67°
55°
27
67°
51°
28
64°
49°
29
63°
52°
30
65°
54°
31
70°
56°
1
70°
57°
2
66°
56°
3
66°
56°
4
69°
57°
5
69°
57°
6
72°
58°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Hyannis
Hyannis's May 2026 forecast shows daily high temperatures ranging from 56° to 72°, with overnight lows between 44° and 58°. The average high for May is 65° with an average low of 52°. 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. See also: June | July | August.
