S
M
T
W
T
F
S
30
83°
58°
31
79°
69°
1
90°
69°
2
74°
69°
3
87°
68°
4
85°
69°
5
79°
61°
6
78°
58°
7
80°
53°
8
81°
61°
9
88°
68°
10
82°
64°
11
80°
57°
12
79°
62°
13
84°
64°
14
83°
61°
15
81°
62°
16
78°
58°
17
78°
59°
18
79°
60°
19
77°
59°
20
76°
55°
21
79°
60°
22
72°
59°
23
72°
59°
24
73°
58°
25
72°
57°
26
77°
57°
27
75°
54°
28
75°
57°
29
76°
57°
30
77°
56°
1
76°
57°
2
75°
56°
3
75°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Mohnton
Mohnton's September 2026 forecast shows daily high temperatures ranging from 72° to 88°, with overnight lows between 53° and 68°. The average high for September is 78° with an average low of 59°. 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 Mohnton. See also: October | November | December.