S
M
T
W
T
F
S
30
78°
62°
31
77°
65°
1
86°
68°
2
82°
68°
3
84°
61°
4
77°
60°
5
72°
56°
6
73°
55°
7
75°
58°
8
75°
59°
9
77°
60°
10
75°
55°
11
76°
53°
12
69°
50°
13
69°
50°
14
73°
53°
15
67°
52°
16
68°
55°
17
69°
48°
18
65°
46°
19
65°
46°
20
66°
50°
21
71°
54°
22
73°
54°
23
74°
53°
24
73°
52°
25
71°
50°
26
71°
51°
27
72°
52°
28
71°
52°
29
72°
48°
30
64°
45°
1
61°
43°
2
64°
48°
3
69°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Long Valley
Long Valley's September 2026 forecast shows daily high temperatures ranging from 61° to 86°, with overnight lows between 43° and 68°. The average high for September is 72° with an average low of 54°. 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 Long Valley. See also: October | November | December.
