S
M
T
W
T
F
S
26
110°
71°
27
97°
73°
28
95°
67°
29
95°
66°
30
101°
71°
31
94°
62°
1
94°
57°
2
101°
63°
3
100°
63°
4
71°
56°
5
79°
58°
6
90°
58°
7
91°
60°
8
96°
65°
9
96°
65°
10
100°
62°
11
106°
63°
12
97°
67°
13
86°
66°
14
91°
66°
15
88°
65°
16
85°
63°
17
94°
64°
18
88°
63°
19
90°
63°
20
93°
64°
21
91°
65°
22
89°
65°
23
91°
69°
24
93°
64°
25
83°
59°
26
82°
59°
27
82°
60°
28
92°
64°
29
93°
63°
30
90°
57°
31
82°
55°
1
81°
54°
2
81°
56°
3
82°
56°
4
83°
58°
5
82°
57°
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 81° to 93°, with overnight lows between 54° and 64°. The average high for August is 85° with an average low of 59°. 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.
