S
M
T
W
T
F
S
30
83°
49°
31
75°
48°
1
74°
49°
2
76°
55°
3
75°
49°
4
75°
56°
5
76°
55°
6
80°
50°
7
78°
48°
8
72°
47°
9
73°
46°
10
71°
52°
11
73°
46°
12
74°
46°
13
71°
45°
14
70°
52°
15
74°
51°
16
75°
43°
17
77°
42°
18
67°
41°
19
66°
42°
20
66°
43°
21
67°
44°
22
64°
43°
23
64°
46°
24
67°
47°
25
68°
47°
26
71°
48°
27
71°
44°
28
72°
38°
29
63°
38°
30
63°
45°
1
62°
46°
2
66°
46°
3
68°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Winchendon
Winchendon's September 2026 forecast shows daily high temperatures ranging from 62° to 83°, with overnight lows between 38° and 56°. The average high for September is 71° with an average low of 47°. 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 Winchendon. See also: October | November | December.
