S
M
T
W
T
F
S
30
75°
54°
31
76°
57°
1
82°
57°
2
82°
54°
3
80°
50°
4
80°
55°
5
79°
50°
6
80°
49°
7
73°
53°
8
71°
54°
9
72°
48°
10
78°
45°
11
72°
53°
12
75°
47°
13
78°
49°
14
74°
46°
15
70°
52°
16
70°
44°
17
69°
44°
18
Hist. Avg.
72°
46°
19
Hist. Avg.
72°
46°
20
Hist. Avg.
72°
46°
21
Hist. Avg.
71°
45°
22
Hist. Avg.
71°
45°
23
Hist. Avg.
70°
44°
24
Hist. Avg.
70°
44°
25
Hist. Avg.
70°
44°
26
Hist. Avg.
69°
43°
27
Hist. Avg.
69°
43°
28
Hist. Avg.
68°
42°
29
Hist. Avg.
68°
42°
30
Hist. Avg.
67°
42°
1
Hist. Avg.
67°
41°
2
Hist. Avg.
66°
41°
3
Hist. Avg.
66°
40°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Keene
Keene's September 2026 forecast shows daily high temperatures ranging from 69° to 82°, with overnight lows between 44° and 57°. The average high for September is 76° with an average low of 51°. 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.
