S
M
T
W
T
F
S
30
79°
58°
31
76°
68°
1
78°
68°
2
75°
68°
3
83°
66°
4
81°
62°
5
76°
58°
6
76°
58°
7
78°
60°
8
75°
63°
9
77°
61°
10
80°
63°
11
80°
58°
12
73°
57°
13
73°
57°
14
78°
58°
15
71°
57°
16
71°
61°
17
74°
56°
18
69°
53°
19
69°
53°
20
70°
57°
21
73°
60°
22
76°
61°
23
77°
60°
24
76°
58°
25
74°
58°
26
74°
57°
27
75°
58°
28
75°
58°
29
74°
56°
30
67°
51°
1
64°
51°
2
66°
55°
3
72°
56°
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 64° to 83°, with overnight lows between 51° and 68°. The average high for September is 74° with an average low of 59°. 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.
