S
M
T
W
T
F
S
30
87°
59°
31
79°
59°
1
79°
62°
2
86°
65°
3
87°
66°
4
87°
67°
5
88°
63°
6
86°
57°
7
78°
56°
8
78°
56°
9
79°
62°
10
82°
62°
11
83°
57°
12
77°
56°
13
76°
57°
14
77°
63°
15
80°
53°
16
84°
52°
17
74°
52°
18
73°
53°
19
73°
52°
20
74°
52°
21
71°
50°
22
72°
50°
23
73°
51°
24
74°
55°
25
77°
57°
26
79°
57°
27
79°
54°
28
72°
58°
29
77°
54°
30
77°
48°
1
71°
52°
2
72°
48°
3
68°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Mount Vernon Township
Mount Vernon Township's September 2026 forecast shows daily high temperatures ranging from 68° to 88°, with overnight lows between 48° and 67°. 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 Mount Vernon Township. See also: October | November | December.
