S
M
T
W
T
F
S
26
52°
41°
27
61°
40°
28
52°
39°
29
52°
44°
30
55°
46°
1
60°
45°
2
55°
47°
3
55°
38°
4
61°
49°
5
64°
52°
6
65°
54°
7
60°
48°
8
56°
42°
9
58°
49°
10
60°
48°
11
63°
47°
12
60°
49°
13
59°
51°
14
60°
48°
15
60°
51°
16
61°
50°
17
60°
48°
18
61°
52°
19
61°
52°
20
62°
51°
21
62°
53°
22
68°
50°
23
61°
50°
24
62°
54°
25
64°
52°
26
63°
53°
27
64°
51°
28
63°
53°
29
64°
55°
30
65°
54°
31
64°
53°
1
65°
51°
2
64°
50°
3
65°
52°
4
65°
51°
5
64°
51°
6
65°
53°
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 55° to 68°, with overnight lows between 38° and 55°. The average high for May is 62° 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 Hyannis. See also: June | July | August.
