S
M
T
W
T
F
S
30
79°
59°
31
85°
51°
1
83°
58°
2
85°
57°
3
85°
53°
4
90°
48°
5
91°
57°
6
91°
48°
7
83°
52°
8
84°
40°
9
84°
36°
10
87°
44°
11
86°
49°
12
81°
38°
13
85°
40°
14
77°
50°
15
72°
36°
16
80°
47°
17
69°
51°
18
82°
51°
19
75°
49°
20
62°
47°
21
68°
45°
22
78°
53°
23
74°
47°
24
78°
50°
25
81°
48°
26
75°
43°
27
75°
47°
28
73°
43°
29
69°
40°
30
67°
41°
1
66°
43°
2
68°
35°
3
71°
42°
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 66° to 81°, with overnight lows between 35° and 53°. The average high for September is 73° with an average low of 44°. 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.
