Click on a day for an hourly weather forecast
The temperatures in Hannibal in September are comfortable with low of 15°C and and high up to 26°C.
You can expect about 3 to 8 days of rain in Hannibal during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Hannibal in September 2025.
If you’re planning to visit Hannibal in the near future, we highly recommend that you review the 14 day weather forecast for Hannibal before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 1° / -6° | 4 | 16 | 11 | 76 mm | Awful | Hannibal in January |
| February | 3° / -4° | 4 | 15 | 9 | 79 mm | Awful | Hannibal in February |
| March | 11° / 3° | 7 | 20 | 4 | 118 mm | Awful | Hannibal in March |
| April | 17° / 7° | 8 | 21 | 1 | 157 mm | Ok | Hannibal in April |
| May | 22° / 13° | 10 | 21 | 0 | 174 mm | Ok | Hannibal in May |
| June | 28° / 18° | 9 | 21 | 0 | 179 mm | Good | Hannibal in June |
| July | 29° / 20° | 8 | 23 | 0 | 148 mm | Ok | Hannibal in July |
| August | 29° / 19° | 6 | 25 | 0 | 125 mm | Good | Hannibal in August |
| September | 26° / 15° | 6 | 24 | 0 | 115 mm | Perfect | Hannibal in September |
| October | 18° / 9° | 6 | 25 | 0 | 117 mm | Good | Hannibal in October |
| November | 11° / 3° | 4 | 24 | 2 | 87 mm | Bad | Hannibal in November |
| December | 5° / -2° | 4 | 21 | 6 | 71 mm | Awful | Hannibal in December |