S
M
T
W
T
F
S
30
81°
65°
31
84°
65°
1
83°
64°
2
86°
65°
3
86°
64°
4
85°
60°
5
79°
64°
6
84°
64°
7
84°
63°
8
79°
60°
9
77°
62°
10
79°
63°
11
84°
62°
12
83°
63°
13
84°
63°
14
83°
62°
15
83°
61°
16
82°
60°
17
81°
53°
18
75°
54°
19
76°
51°
20
74°
51°
21
72°
50°
22
72°
53°
23
73°
55°
24
79°
56°
25
79°
57°
26
78°
56°
27
79°
57°
28
78°
54°
29
77°
53°
30
77°
53°
1
74°
51°
2
76°
53°
3
70°
48°
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 70° to 86°, with overnight lows between 48° and 65°. The average high for September is 79° with an average low of 58°. 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.
