S
M
T
W
T
F
S
30
92°
69°
31
97°
73°
1
99°
72°
2
98°
74°
3
97°
75°
4
97°
75°
5
98°
74°
6
86°
70°
7
85°
65°
8
95°
63°
9
81°
69°
10
76°
64°
11
82°
66°
12
86°
62°
13
77°
59°
14
80°
71°
15
90°
64°
16
78°
62°
17
78°
59°
18
77°
57°
19
71°
50°
20
71°
52°
21
75°
51°
22
77°
57°
23
78°
54°
24
75°
51°
25
80°
58°
26
80°
57°
27
79°
57°
28
80°
56°
29
78°
57°
30
78°
54°
1
76°
49°
2
76°
55°
3
77°
56°
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 71° to 90°, with overnight lows between 49° and 71°. The average high for September is 78° with an average low of 57°. 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.
