S
M
T
W
T
F
S
26
80°
65°
27
79°
66°
28
82°
66°
29
82°
65°
30
81°
66°
31
80°
66°
1
80°
65°
2
79°
66°
3
81°
66°
4
80°
65°
5
81°
65°
6
78°
64°
7
80°
66°
8
81°
62°
9
76°
59°
10
75°
60°
11
76°
65°
12
76°
64°
13
77°
65°
14
76°
66°
15
76°
66°
16
78°
65°
17
79°
59°
18
76°
57°
19
77°
61°
20
76°
62°
21
75°
63°
22
81°
61°
23
80°
62°
24
77°
58°
25
74°
57°
26
75°
58°
27
74°
58°
28
73°
56°
29
75°
57°
30
75°
62°
31
78°
63°
1
80°
63°
2
80°
62°
3
79°
56°
4
79°
55°
5
72°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Block Island
Block Island's August 2026 forecast shows daily high temperatures ranging from 72° to 82°, with overnight lows between 55° and 66°. The average high for August is 78° with an average low of 62°. 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 Block Island. See also: September | October | November.
