S
M
T
W
T
F
S
30
75°
61°
31
77°
63°
1
76°
57°
2
77°
56°
3
70°
57°
4
72°
58°
5
72°
63°
6
75°
61°
7
77°
57°
8
70°
61°
9
70°
62°
10
73°
62°
11
75°
61°
12
74°
60°
13
69°
60°
14
68°
55°
15
72°
55°
16
68°
54°
17
68°
57°
18
69°
58°
19
72°
59°
20
69°
60°
21
72°
58°
22
71°
52°
23
70°
57°
24
66°
59°
25
71°
56°
26
64°
54°
27
66°
57°
28
Hist. Avg.
67°
54°
29
Hist. Avg.
67°
54°
30
Hist. Avg.
67°
53°
1
Hist. Avg.
66°
53°
2
Hist. Avg.
66°
53°
3
Hist. Avg.
66°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Nantucket
Nantucket's September 2026 forecast shows daily high temperatures ranging from 64° to 77°, with overnight lows between 52° and 63°. The average high for September is 71° with an average low of 58°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Nantucket. See also: October | November | December.
