S
M
T
W
T
F
S
30
80°
66°
31
85°
66°
1
85°
65°
2
86°
65°
3
86°
62°
4
84°
64°
5
79°
65°
6
85°
63°
7
82°
58°
8
76°
56°
9
77°
62°
10
76°
63°
11
83°
62°
12
83°
63°
13
84°
63°
14
83°
60°
15
82°
59°
16
73°
58°
17
74°
51°
18
73°
53°
19
73°
49°
20
71°
49°
21
71°
50°
22
72°
57°
23
74°
57°
24
78°
58°
25
78°
58°
26
77°
57°
27
78°
58°
28
77°
54°
29
76°
53°
30
74°
52°
1
73°
53°
2
77°
54°
3
70°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Keokuk
Keokuk's September 2026 forecast shows daily high temperatures ranging from 70° to 86°, with overnight lows between 45° and 66°. The average high for September is 78° 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 Keokuk. See also: October | November | December.
