S
M
T
W
T
F
S
30
84°
69°
31
83°
69°
1
84°
68°
2
83°
69°
3
84°
67°
4
83°
62°
5
81°
67°
6
81°
68°
7
81°
67°
8
Hist. Avg.
78°
64°
9
Hist. Avg.
78°
63°
10
Hist. Avg.
78°
63°
11
Hist. Avg.
78°
63°
12
Hist. Avg.
77°
62°
13
Hist. Avg.
77°
62°
14
Hist. Avg.
76°
62°
15
Hist. Avg.
76°
61°
16
Hist. Avg.
76°
61°
17
Hist. Avg.
76°
61°
18
Hist. Avg.
75°
60°
19
Hist. Avg.
75°
60°
20
Hist. Avg.
74°
60°
21
Hist. Avg.
74°
59°
22
Hist. Avg.
74°
59°
23
Hist. Avg.
73°
58°
24
Hist. Avg.
73°
58°
25
Hist. Avg.
73°
58°
26
Hist. Avg.
72°
57°
27
Hist. Avg.
72°
57°
28
Hist. Avg.
72°
57°
29
Hist. Avg.
71°
56°
30
Hist. Avg.
71°
56°
1
Hist. Avg.
70°
56°
2
Hist. Avg.
70°
55°
3
Hist. Avg.
70°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Lynbrook
Lynbrook's September 2026 forecast shows daily high temperatures ranging from 81° to 84°, with overnight lows between 62° and 69°. The average high for September is 83° with an average low of 67°. 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 Lynbrook. See also: October | November | December.
