S
M
T
W
T
F
S
30
77°
62°
31
77°
61°
1
79°
60°
2
76°
59°
3
75°
58°
4
74°
58°
5
69°
52°
6
65°
45°
7
71°
51°
8
71°
50°
9
69°
52°
10
69°
51°
11
66°
44°
12
67°
44°
13
68°
45°
14
71°
49°
15
73°
50°
16
72°
50°
17
71°
49°
18
73°
51°
19
72°
51°
20
68°
50°
21
71°
49°
22
72°
50°
23
72°
49°
24
71°
48°
25
65°
45°
26
61°
40°
27
63°
43°
28
68°
45°
29
69°
46°
30
69°
46°
1
68°
45°
2
68°
46°
3
67°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Windham
Windham's September 2026 forecast shows daily high temperatures ranging from 61° to 79°, with overnight lows between 40° and 62°. The average high for September is 70° 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 Windham. See also: October | November | December.
