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
83°
71°
6
85°
72°
7
91°
73°
8
88°
73°
9
87°
68°
10
84°
70°
11
83°
67°
12
80°
66°
13
79°
67°
14
80°
64°
15
77°
65°
16
77°
62°
17
76°
63°
18
77°
63°
19
75°
66°
20
74°
66°
21
74°
64°
22
73°
66°
23
77°
67°
24
79°
67°
25
77°
66°
26
73°
65°
27
72°
65°
28
73°
66°
29
74°
65°
30
77°
66°
31
76°
65°
1
77°
63°
2
71°
61°
3
70°
62°
4
70°
61°
5
71°
60°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Barnstable
Barnstable's August 2026 forecast shows daily high temperatures ranging from 70° to 91°, with overnight lows between 60° and 73°. The average high for August is 78° with an average low of 66°. 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 Barnstable. See also: September | October | November.
