S
M
T
W
T
F
S
26
56°
35°
27
57°
34°
28
56°
33°
29
54°
34°
30
58°
35°
1
64°
37°
2
56°
43°
3
57°
42°
4
58°
41°
5
58°
42°
6
65°
45°
7
67°
38°
8
59°
36°
9
57°
35°
10
62°
45°
11
61°
41°
12
58°
40°
13
60°
38°
14
66°
47°
15
70°
49°
16
73°
49°
17
70°
42°
18
61°
38°
19
62°
46°
20
72°
50°
21
74°
50°
22
74°
52°
23
76°
52°
24
75°
52°
25
70°
51°
26
66°
52°
27
66°
52°
28
67°
51°
29
66°
52°
30
67°
46°
31
68°
52°
1
69°
42°
2
69°
44°
3
68°
46°
4
71°
50°
5
72°
49°
6
69°
50°
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 54° to 76°, with overnight lows between 33° and 52°. The average high for May is 65° with an average low of 44°. 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.
