S
M
T
W
T
F
S
30
80°
61°
31
79°
69°
1
78°
67°
2
76°
70°
3
83°
73°
4
84°
65°
5
81°
62°
6
75°
63°
7
76°
64°
8
78°
64°
9
77°
63°
10
82°
66°
11
79°
63°
12
78°
62°
13
77°
63°
14
76°
63°
15
77°
59°
16
71°
63°
17
74°
58°
18
70°
55°
19
76°
60°
20
76°
60°
21
73°
58°
22
71°
58°
23
71°
61°
24
74°
58°
25
71°
57°
26
73°
61°
27
74°
60°
28
73°
55°
29
66°
53°
30
66°
54°
1
65°
51°
2
64°
54°
3
65°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Copiague
Copiague's September 2026 forecast shows daily high temperatures ranging from 64° to 84°, with overnight lows between 51° and 73°. The average high for September is 74° 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 Copiague. See also: October | November | December.
