S
M
T
W
T
F
S
30
75°
63°
31
79°
64°
1
80°
64°
2
80°
63°
3
79°
57°
4
79°
55°
5
73°
57°
6
73°
62°
7
74°
62°
8
77°
61°
9
78°
60°
10
77°
61°
11
76°
60°
12
77°
59°
13
77°
61°
14
76°
61°
15
77°
60°
16
78°
57°
17
76°
60°
18
74°
57°
19
75°
55°
20
71°
51°
21
68°
50°
22
67°
56°
23
68°
54°
24
73°
50°
25
67°
49°
26
66°
49°
27
67°
54°
28
71°
55°
29
72°
51°
30
71°
51°
1
64°
54°
2
65°
47°
3
64°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Amagansett
Amagansett's September 2026 forecast shows daily high temperatures ranging from 64° to 80°, with overnight lows between 47° and 64°. The average high for September is 73° with an average low of 57°. 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 Amagansett. See also: October | November | December.
