S
M
T
W
T
F
S
30
78°
60°
31
80°
56°
1
78°
55°
2
77°
54°
3
76°
53°
4
77°
53°
5
77°
57°
6
78°
57°
7
76°
58°
8
77°
56°
9
76°
53°
10
78°
59°
11
80°
60°
12
80°
60°
13
82°
58°
14
80°
59°
15
80°
56°
16
79°
57°
17
74°
59°
18
81°
58°
19
79°
57°
20
78°
50°
21
81°
48°
22
75°
47°
23
69°
48°
24
Hist. Avg.
73°
51°
25
Hist. Avg.
72°
51°
26
Hist. Avg.
72°
50°
27
Hist. Avg.
71°
50°
28
Hist. Avg.
71°
50°
29
Hist. Avg.
71°
49°
30
Hist. Avg.
70°
49°
1
Hist. Avg.
70°
48°
2
Hist. Avg.
69°
48°
3
Hist. Avg.
69°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Mendon
Mendon's September 2026 forecast shows daily high temperatures ranging from 69° to 82°, with overnight lows between 47° and 60°. The average high for September is 78° with an average low of 56°. 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.
