S
M
T
W
T
F
S
30
85°
64°
31
84°
67°
1
84°
64°
2
85°
66°
3
83°
66°
4
83°
65°
5
82°
65°
6
82°
64°
7
81°
64°
8
81°
63°
9
80°
64°
10
81°
64°
11
82°
63°
12
82°
64°
13
81°
65°
14
82°
64°
15
80°
64°
16
80°
63°
17
79°
63°
18
78°
61°
19
76°
53°
20
72°
58°
21
72°
62°
22
73°
53°
23
72°
53°
24
71°
55°
25
72°
59°
26
76°
58°
27
71°
54°
28
70°
53°
29
69°
52°
30
69°
52°
1
70°
59°
2
71°
57°
3
71°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Lake Success
Lake Success's September 2026 forecast shows daily high temperatures ranging from 69° to 85°, with overnight lows between 50° and 67°. The average high for September is 77° 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 Lake Success. See also: October | November | December.
