S
M
T
W
T
F
S
26
78°
67°
27
78°
66°
28
76°
67°
29
79°
67°
30
81°
66°
31
80°
68°
1
80°
67°
2
79°
67°
3
80°
66°
4
80°
62°
5
79°
61°
6
74°
60°
7
75°
64°
8
78°
67°
9
80°
66°
10
79°
64°
11
75°
67°
12
79°
66°
13
Hist. Avg.
76°
63°
14
Hist. Avg.
76°
63°
15
Hist. Avg.
76°
63°
16
Hist. Avg.
76°
63°
17
Hist. Avg.
76°
62°
18
Hist. Avg.
76°
62°
19
Hist. Avg.
76°
62°
20
Hist. Avg.
76°
62°
21
Hist. Avg.
75°
62°
22
Hist. Avg.
75°
62°
23
Hist. Avg.
75°
62°
24
Hist. Avg.
75°
62°
25
Hist. Avg.
75°
61°
26
Hist. Avg.
75°
61°
27
Hist. Avg.
75°
61°
28
Hist. Avg.
74°
61°
29
Hist. Avg.
74°
61°
30
Hist. Avg.
74°
60°
31
Hist. Avg.
74°
60°
1
Hist. Avg.
74°
60°
2
Hist. Avg.
74°
60°
3
Hist. Avg.
73°
60°
4
Hist. Avg.
73°
60°
5
Hist. Avg.
73°
59°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
August Weather in Nantucket
Nantucket's August 2026 forecast shows daily high temperatures ranging from 74° to 81°, with overnight lows between 60° and 68°. The average high for August is 78° with an average low of 65°. 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 Nantucket. See also: September | October | November.
