S
M
T
W
T
F
S
30
80°
56°
31
80°
51°
1
76°
51°
2
72°
52°
3
72°
51°
4
73°
51°
5
72°
50°
6
71°
50°
7
72°
51°
8
74°
51°
9
71°
54°
10
71°
52°
11
70°
54°
12
75°
54°
13
74°
53°
14
75°
50°
15
68°
49°
16
69°
49°
17
66°
48°
18
68°
52°
19
67°
47°
20
72°
54°
21
70°
45°
22
66°
44°
23
Hist. Avg.
68°
49°
24
Hist. Avg.
68°
49°
25
Hist. Avg.
68°
49°
26
Hist. Avg.
67°
48°
27
Hist. Avg.
67°
48°
28
Hist. Avg.
66°
47°
29
Hist. Avg.
66°
47°
30
Hist. Avg.
66°
47°
1
Hist. Avg.
65°
46°
2
Hist. Avg.
65°
46°
3
Hist. Avg.
64°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Windham
Windham's September 2026 forecast shows daily high temperatures ranging from 66° to 80°, with overnight lows between 44° and 56°. The average high for September is 72° 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 Windham. See also: October | November | December.
