S
M
T
W
T
F
S
26
81°
66°
27
82°
66°
28
81°
67°
29
78°
66°
30
77°
66°
31
81°
65°
1
82°
67°
2
82°
65°
3
84°
65°
4
83°
66°
5
82°
66°
6
80°
64°
7
77°
65°
8
78°
60°
9
77°
61°
10
78°
60°
11
77°
65°
12
80°
65°
13
82°
64°
14
82°
59°
15
78°
59°
16
76°
60°
17
79°
65°
18
76°
59°
19
79°
59°
20
77°
60°
21
78°
60°
22
79°
61°
23
80°
58°
24
80°
58°
25
79°
59°
26
78°
60°
27
76°
61°
28
74°
62°
29
80°
64°
30
81°
62°
31
80°
56°
1
77°
55°
2
73°
57°
3
73°
56°
4
74°
56°
5
73°
55°
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 73° to 84°, with overnight lows between 55° and 67°. The average high for August is 79° 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.
