S
M
T
W
T
F
S
30
85°
55°
31
82°
66°
1
93°
69°
2
87°
69°
3
91°
70°
4
84°
64°
5
80°
57°
6
76°
57°
7
78°
57°
8
73°
55°
9
74°
54°
10
78°
54°
11
77°
53°
12
74°
52°
13
74°
53°
14
75°
52°
15
74°
57°
16
72°
56°
17
72°
51°
18
70°
47°
19
69°
48°
20
72°
53°
21
77°
55°
22
77°
55°
23
78°
54°
24
78°
54°
25
76°
52°
26
75°
52°
27
76°
53°
28
75°
53°
29
76°
52°
30
70°
47°
1
67°
44°
2
69°
49°
3
73°
51°
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 67° to 93°, with overnight lows between 44° and 70°. The average high for September is 76° 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.
