S
M
T
W
T
F
S
30
86°
70°
31
99°
73°
1
99°
73°
2
97°
75°
3
99°
75°
4
99°
75°
5
97°
72°
6
88°
70°
7
88°
68°
8
97°
68°
9
81°
70°
10
77°
64°
11
82°
66°
12
86°
66°
13
79°
59°
14
86°
59°
15
95°
70°
16
88°
70°
17
95°
73°
18
91°
73°
19
93°
70°
20
76°
62°
21
66°
56°
22
66°
49°
23
69°
53°
24
69°
56°
25
70°
54°
26
73°
55°
27
73°
53°
28
74°
56°
29
75°
54°
30
73°
54°
1
75°
55°
2
72°
50°
3
70°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Hannibal
Hannibal's September 2026 forecast shows daily high temperatures ranging from 66° to 93°, with overnight lows between 49° and 70°. The average high for September is 73° with an average low of 56°. 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 Hannibal. See also: October | November | December.
