S
M
T
W
T
F
S
30
80°
59°
31
82°
58°
1
85°
63°
2
84°
67°
3
85°
65°
4
82°
57°
5
83°
65°
6
83°
64°
7
82°
65°
8
85°
65°
9
85°
64°
10
86°
65°
11
85°
64°
12
83°
65°
13
83°
65°
14
81°
64°
15
80°
63°
16
78°
63°
17
77°
61°
18
79°
56°
19
75°
52°
20
73°
55°
21
72°
57°
22
75°
50°
23
71°
55°
24
70°
59°
25
70°
59°
26
76°
58°
27
70°
60°
28
71°
58°
29
71°
56°
30
72°
48°
1
72°
45°
2
65°
45°
3
63°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Fort Madison
Fort Madison's September 2026 forecast shows daily high temperatures ranging from 63° to 86°, with overnight lows between 44° and 67°. The average high for September is 78° 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 Fort Madison. See also: October | November | December.
