S
M
T
W
T
F
S
30
76°
60°
31
75°
61°
1
81°
57°
2
76°
57°
3
78°
55°
4
76°
54°
5
75°
54°
6
78°
58°
7
80°
58°
8
79°
57°
9
80°
58°
10
77°
58°
11
77°
57°
12
79°
57°
13
79°
56°
14
78°
57°
15
79°
56°
16
78°
50°
17
76°
53°
18
70°
56°
19
75°
55°
20
77°
55°
21
75°
54°
22
76°
48°
23
73°
52°
24
73°
48°
25
Hist. Avg.
71°
49°
26
Hist. Avg.
70°
48°
27
Hist. Avg.
70°
48°
28
Hist. Avg.
70°
48°
29
Hist. Avg.
69°
47°
30
Hist. Avg.
69°
47°
1
Hist. Avg.
68°
46°
2
Hist. Avg.
68°
46°
3
Hist. Avg.
68°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in South Windham
South Windham's September 2026 forecast shows daily high temperatures ranging from 70° to 81°, with overnight lows between 48° and 61°. The average high for September is 77° with an average low of 55°. 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 South Windham. See also: October | November | December.
