S
M
T
W
T
F
S
30
77°
67°
31
78°
67°
1
83°
65°
2
80°
62°
3
78°
60°
4
80°
64°
5
82°
62°
6
79°
62°
7
81°
64°
8
83°
65°
9
84°
66°
10
83°
64°
11
80°
64°
12
79°
56°
13
83°
59°
14
76°
55°
15
82°
57°
16
81°
51°
17
72°
52°
18
72°
54°
19
78°
48°
20
71°
48°
21
71°
51°
22
70°
48°
23
71°
49°
24
74°
53°
25
75°
58°
26
75°
56°
27
74°
54°
28
77°
54°
29
72°
47°
30
74°
57°
1
76°
43°
2
79°
42°
3
75°
42°
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 70° to 84°, with overnight lows between 42° and 67°. The average high for September is 77° 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.
