S
M
T
W
T
F
S
30
80°
54°
31
82°
43°
1
82°
53°
2
83°
49°
3
82°
44°
4
86°
43°
5
86°
52°
6
85°
43°
7
74°
45°
8
81°
48°
9
84°
46°
10
86°
54°
11
86°
54°
12
86°
55°
13
76°
49°
14
74°
52°
15
81°
57°
16
84°
59°
17
83°
60°
18
82°
58°
19
80°
55°
20
77°
48°
21
79°
54°
22
70°
51°
23
69°
44°
24
72°
50°
25
71°
45°
26
73°
47°
27
73°
48°
28
68°
39°
29
65°
38°
30
63°
37°
1
64°
37°
2
65°
38°
3
66°
40°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Mendon
Mendon's September 2026 forecast shows daily high temperatures ranging from 63° to 86°, with overnight lows between 37° and 60°. The average high for September is 75° with an average low of 48°. 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 Mendon. See also: October | November | December.
