S
M
T
W
T
F
S
30
84°
66°
31
84°
66°
1
83°
61°
2
77°
59°
3
75°
59°
4
76°
58°
5
76°
58°
6
80°
62°
7
83°
65°
8
82°
64°
9
79°
63°
10
81°
64°
11
82°
64°
12
83°
63°
13
82°
65°
14
82°
55°
15
74°
55°
16
72°
56°
17
74°
55°
18
72°
53°
19
73°
54°
20
72°
54°
21
78°
56°
22
78°
60°
23
77°
52°
24
78°
51°
25
73°
51°
26
70°
53°
27
74°
58°
28
75°
58°
29
76°
50°
30
72°
50°
1
68°
55°
2
69°
55°
3
73°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Locust Valley
Locust Valley's September 2026 forecast shows daily high temperatures ranging from 68° to 84°, with overnight lows between 50° and 66°. The average high for September is 77° with an average low of 58°. 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 Locust Valley. See also: October | November | December.
