S
M
T
W
T
F
S
30
79°
52°
31
78°
53°
1
68°
61°
2
72°
61°
3
79°
60°
4
82°
58°
5
76°
53°
6
72°
48°
7
78°
46°
8
78°
47°
9
76°
54°
10
83°
65°
11
74°
48°
12
75°
42°
13
69°
60°
14
68°
45°
15
70°
41°
16
78°
48°
17
75°
58°
18
76°
51°
19
65°
41°
20
55°
43°
21
65°
48°
22
65°
41°
23
65°
35°
24
68°
40°
25
69°
53°
26
62°
52°
27
57°
51°
28
59°
53°
29
67°
48°
30
72°
54°
1
74°
51°
2
73°
49°
3
72°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Keene
Keene's September 2026 forecast shows daily high temperatures ranging from 57° to 74°, with overnight lows between 40° and 54°. The average high for September is 67° with an average low of 50°. 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. See also: October | November | December.
