S
M
T
W
T
F
S
30
77°
46°
31
67°
45°
1
67°
52°
2
72°
53°
3
66°
45°
4
66°
53°
5
68°
48°
6
71°
46°
7
68°
45°
8
66°
44°
9
65°
44°
10
65°
47°
11
66°
42°
12
65°
43°
13
64°
42°
14
66°
49°
15
69°
42°
16
63°
40°
17
61°
39°
18
60°
39°
19
59°
40°
20
60°
41°
21
60°
42°
22
59°
40°
23
60°
46°
24
65°
46°
25
66°
45°
26
65°
47°
27
66°
39°
28
62°
36°
29
55°
36°
30
57°
45°
1
56°
47°
2
59°
45°
3
62°
44°
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 55° to 77°, with overnight lows between 36° and 53°. The average high for September is 64° with an average low of 44°. 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.
