S
M
T
W
T
F
S
30
91°
62°
31
94°
68°
1
97°
69°
2
97°
72°
3
97°
72°
4
99°
71°
5
101°
71°
6
93°
71°
7
89°
61°
8
94°
59°
9
95°
76°
10
85°
74°
11
82°
69°
12
94°
66°
13
93°
67°
14
90°
67°
15
97°
69°
16
98°
72°
17
99°
68°
18
99°
66°
19
98°
65°
20
96°
70°
21
86°
63°
22
78°
56°
23
77°
55°
24
78°
58°
25
78°
59°
26
77°
57°
27
78°
53°
28
81°
54°
29
82°
54°
30
84°
58°
1
85°
50°
2
74°
58°
3
77°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Cape Girardeau
Cape Girardeau's September 2026 forecast shows daily high temperatures ranging from 74° to 99°, with overnight lows between 50° and 70°. The average high for September is 83° with an average low of 58°. 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 Cape Girardeau. See also: October | November | December.
