S
M
T
W
T
F
S
26
71°
64°
27
78°
61°
28
78°
69°
29
71°
67°
30
68°
64°
31
77°
64°
1
81°
68°
2
80°
72°
3
79°
70°
4
83°
61°
5
84°
58°
6
84°
73°
7
88°
75°
8
85°
75°
9
88°
73°
10
83°
66°
11
87°
72°
12
82°
66°
13
80°
68°
14
81°
62°
15
78°
59°
16
77°
69°
17
76°
66°
18
80°
66°
19
83°
67°
20
82°
66°
21
81°
65°
22
80°
63°
23
79°
64°
24
79°
63°
25
80°
63°
26
80°
62°
27
79°
61°
28
74°
60°
29
74°
62°
30
76°
64°
31
75°
64°
1
74°
63°
2
77°
65°
3
79°
64°
4
77°
64°
5
76°
63°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Hyannis
Hyannis's August 2026 forecast shows daily high temperatures ranging from 74° to 83°, with overnight lows between 59° and 69°. The average high for August is 78° with an average low of 64°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in Hyannis. See also: September | October | November.
