S
M
T
W
T
F
S
30
85°
55°
31
82°
66°
1
93°
69°
2
82°
68°
3
88°
68°
4
85°
68°
5
80°
61°
6
79°
54°
7
78°
51°
8
82°
52°
9
89°
58°
10
83°
69°
11
80°
59°
12
77°
57°
13
86°
68°
14
73°
51°
15
76°
46°
16
86°
54°
17
81°
66°
18
79°
57°
19
70°
56°
20
74°
64°
21
65°
56°
22
60°
55°
23
68°
46°
24
67°
41°
25
74°
36°
26
66°
46°
27
64°
57°
28
67°
57°
29
71°
60°
30
76°
60°
1
86°
64°
2
82°
50°
3
70°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Mount Union
Mount Union's September 2026 forecast shows daily high temperatures ranging from 70° to 86°, with overnight lows between 50° and 64°. The average high for September is 79° with an average low of 55°. 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 Union. See also: October | November | December.
