S
M
T
W
T
F
S
30
76°
58°
31
77°
58°
1
76°
59°
2
76°
59°
3
75°
60°
4
74°
59°
5
76°
59°
6
75°
58°
7
74°
57°
8
73°
56°
9
73°
56°
10
74°
62°
11
73°
55°
12
73°
55°
13
76°
54°
14
76°
60°
15
74°
60°
16
74°
57°
17
71°
54°
18
71°
53°
19
72°
55°
20
75°
59°
21
72°
56°
22
70°
55°
23
74°
58°
24
73°
56°
25
75°
57°
26
68°
49°
27
71°
51°
28
66°
50°
29
65°
49°
30
65°
49°
1
Hist. Avg.
69°
52°
2
Hist. Avg.
69°
51°
3
Hist. Avg.
68°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Yaphank
Yaphank's September 2026 forecast shows daily high temperatures ranging from 65° to 77°, with overnight lows between 49° and 62°. The average high for September is 73° with an average low of 56°. 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 Yaphank. See also: October | November | December.
