S
M
T
W
T
F
S
30
80°
54°
31
79°
53°
1
80°
54°
2
81°
53°
3
79°
46°
4
72°
43°
5
70°
51°
6
71°
53°
7
78°
52°
8
79°
52°
9
78°
51°
10
73°
49°
11
76°
50°
12
77°
51°
13
77°
51°
14
76°
50°
15
76°
49°
16
75°
41°
17
69°
48°
18
73°
44°
19
69°
41°
20
70°
39°
21
64°
36°
22
63°
45°
23
65°
41°
24
64°
38°
25
62°
36°
26
62°
36°
27
63°
44°
28
70°
42°
29
69°
38°
30
63°
38°
1
62°
39°
2
62°
33°
3
61°
33°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Keene Valley
Keene Valley's September 2026 forecast shows daily high temperatures ranging from 61° to 81°, with overnight lows between 33° and 54°. The average high for September is 71° with an average low of 45°. 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 Keene Valley. See also: October | November | December.
