S
M
T
W
T
F
S
30
83°
57°
31
82°
59°
1
83°
59°
2
82°
58°
3
83°
59°
4
82°
58°
5
81°
57°
6
80°
57°
7
80°
56°
8
79°
57°
9
80°
56°
10
80°
55°
11
79°
54°
12
81°
55°
13
81°
56°
14
80°
56°
15
80°
55°
16
79°
56°
17
78°
56°
18
77°
53°
19
73°
46°
20
71°
53°
21
71°
54°
22
72°
45°
23
70°
44°
24
69°
46°
25
71°
51°
26
73°
52°
27
68°
45°
28
67°
45°
29
67°
44°
30
68°
49°
1
67°
50°
2
67°
42°
3
66°
40°
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 66° to 83°, with overnight lows between 40° and 59°. The average high for September is 76° with an average low of 52°. 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.
