S
M
T
W
T
F
S
30
89°
69°
31
91°
71°
1
89°
70°
2
89°
65°
3
88°
64°
4
86°
64°
5
87°
65°
6
88°
69°
7
90°
72°
8
94°
72°
9
94°
71°
10
93°
69°
11
91°
70°
12
87°
70°
13
91°
65°
14
93°
62°
15
86°
62°
16
88°
63°
17
86°
62°
18
87°
63°
19
87°
62°
20
88°
65°
21
90°
66°
22
84°
67°
23
84°
66°
24
85°
66°
25
83°
65°
26
84°
66°
27
87°
63°
28
86°
64°
29
88°
64°
30
87°
63°
1
88°
62°
2
88°
57°
3
89°
57°
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 83° to 94°, with overnight lows between 57° and 72°. The average high for September is 88° with an average low of 65°. 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.
