S
M
T
W
T
F
S
30
78°
60°
31
78°
66°
1
78°
63°
2
69°
61°
3
83°
67°
4
82°
68°
5
78°
62°
6
73°
59°
7
77°
53°
8
78°
58°
9
81°
61°
10
84°
69°
11
77°
59°
12
75°
55°
13
77°
64°
14
73°
53°
15
69°
51°
16
78°
56°
17
81°
66°
18
79°
63°
19
69°
61°
20
70°
59°
21
71°
57°
22
65°
55°
23
67°
56°
24
67°
52°
25
67°
53°
26
69°
54°
27
71°
54°
28
69°
53°
29
71°
54°
30
70°
55°
1
73°
53°
2
72°
52°
3
67°
56°
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 65° to 73°, with overnight lows between 52° and 61°. The average high for September is 69° with an average low of 55°. 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.
