S
M
T
W
T
F
S
30
81°
54°
31
77°
53°
1
67°
60°
2
71°
60°
3
78°
59°
4
80°
56°
5
74°
54°
6
70°
48°
7
77°
47°
8
74°
53°
9
73°
64°
10
80°
52°
11
72°
42°
12
75°
54°
13
77°
58°
14
75°
52°
15
73°
58°
16
74°
51°
17
71°
48°
18
68°
49°
19
67°
44°
20
66°
46°
21
69°
45°
22
64°
49°
23
65°
50°
24
68°
48°
25
69°
49°
26
71°
46°
27
64°
42°
28
66°
45°
29
71°
48°
30
71°
48°
1
70°
47°
2
69°
48°
3
67°
46°
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 64° to 80°, with overnight lows between 42° and 64°. The average high for September is 70° with an average low of 49°. 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.
