S
M
T
W
T
F
S
30
80°
61°
31
79°
69°
1
80°
67°
2
75°
70°
3
82°
70°
4
84°
64°
5
79°
62°
6
74°
63°
7
76°
61°
8
77°
60°
9
75°
62°
10
76°
61°
11
76°
63°
12
78°
62°
13
77°
60°
14
75°
59°
15
71°
59°
16
71°
63°
17
73°
56°
18
70°
55°
19
69°
54°
20
70°
57°
21
74°
62°
22
77°
62°
23
78°
61°
24
77°
60°
25
75°
57°
26
75°
59°
27
76°
60°
28
75°
60°
29
76°
57°
30
68°
52°
1
65°
51°
2
67°
56°
3
72°
58°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Oyster Bay
Oyster Bay's September 2026 forecast shows daily high temperatures ranging from 65° to 84°, with overnight lows between 51° and 70°. The average high for September is 75° with an average low of 60°. 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 Oyster Bay. See also: October | November | December.
