S
M
T
W
T
F
S
30
84°
59°
31
76°
57°
1
76°
58°
2
76°
64°
3
77°
58°
4
77°
65°
5
80°
64°
6
82°
58°
7
80°
57°
8
74°
56°
9
74°
55°
10
75°
62°
11
75°
55°
12
77°
56°
13
73°
55°
14
72°
61°
15
75°
60°
16
78°
53°
17
79°
52°
18
70°
51°
19
69°
52°
20
69°
52°
21
70°
52°
22
67°
52°
23
67°
55°
24
68°
56°
25
68°
56°
26
74°
57°
27
73°
52°
28
74°
49°
29
67°
49°
30
65°
55°
1
66°
56°
2
70°
54°
3
71°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Peconic
Peconic's September 2026 forecast shows daily high temperatures ranging from 65° to 84°, with overnight lows between 49° and 65°. 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 Peconic. See also: October | November | December.
