S
M
T
W
T
F
S
30
87°
61°
31
85°
59°
1
82°
59°
2
82°
60°
3
83°
61°
4
85°
66°
5
88°
65°
6
88°
64°
7
87°
62°
8
82°
58°
9
81°
57°
10
81°
56°
11
82°
56°
12
80°
57°
13
79°
55°
14
78°
56°
15
79°
57°
16
79°
58°
17
82°
57°
18
82°
58°
19
84°
61°
20
84°
54°
21
83°
53°
22
Hist. Avg.
80°
55°
23
Hist. Avg.
80°
55°
24
Hist. Avg.
79°
54°
25
Hist. Avg.
79°
54°
26
Hist. Avg.
78°
54°
27
Hist. Avg.
78°
53°
28
Hist. Avg.
78°
53°
29
Hist. Avg.
78°
52°
30
Hist. Avg.
77°
52°
1
Hist. Avg.
77°
52°
2
Hist. Avg.
76°
51°
3
Hist. Avg.
76°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Cape Girardeau
Cape Girardeau's September 2026 forecast shows daily high temperatures ranging from 78° to 88°, with overnight lows between 53° and 66°. The average high for September is 83° with an average low of 59°. 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.
