S
M
T
W
T
F
S
30
77°
51°
31
78°
50°
1
75°
46°
2
75°
49°
3
82°
51°
4
85°
51°
5
84°
50°
6
79°
51°
7
82°
50°
8
83°
50°
9
84°
49°
10
83°
48°
11
85°
48°
12
82°
51°
13
84°
50°
14
85°
48°
15
82°
44°
16
72°
42°
17
70°
47°
18
77°
46°
19
78°
47°
20
80°
46°
21
81°
46°
22
81°
45°
23
80°
45°
24
81°
44°
25
80°
38°
26
80°
32°
27
64°
36°
28
64°
38°
29
73°
41°
30
75°
33°
1
74°
27°
2
62°
33°
3
61°
36°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Midwest
Midwest's September 2026 forecast shows daily high temperatures ranging from 61° to 85°, with overnight lows between 27° and 51°. The average high for September is 78° with an average low of 45°. 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 Midwest. See also: October | November | December.
