Click on a day for an hourly weather forecast
The temperatures in Cape Girardeau in September are comfortable with low of 16°C and and high up to 28°C.
You can expect about 3 to 8 days of rain in Cape Girardeau 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 Cape Girardeau in September 2025.
If you’re planning to visit Cape Girardeau in the near future, we highly recommend that you review the 14 day weather forecast for Cape Girardeau before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 5° / -2° | 6 | 20 | 5 | 122 mm | Awful | Cape Girardeau in January |
| February | 7° / -1° | 6 | 16 | 6 | 149 mm | Bad | Cape Girardeau in February |
| March | 14° / 5° | 9 | 19 | 2 | 190 mm | Bad | Cape Girardeau in March |
| April | 19° / 9° | 8 | 22 | 0 | 209 mm | Ok | Cape Girardeau in April |
| May | 25° / 15° | 9 | 22 | 0 | 190 mm | Good | Cape Girardeau in May |
| June | 30° / 20° | 8 | 22 | 0 | 146 mm | Ok | Cape Girardeau in June |
| July | 31° / 21° | 8 | 23 | 0 | 144 mm | Ok | Cape Girardeau in July |
| August | 31° / 20° | 7 | 24 | 0 | 126 mm | Ok | Cape Girardeau in August |
| September | 28° / 16° | 5 | 25 | 0 | 93 mm | Perfect | Cape Girardeau in September |
| October | 21° / 11° | 5 | 26 | 0 | 133 mm | Good | Cape Girardeau in October |
| November | 13° / 5° | 5 | 24 | 1 | 133 mm | Ok | Cape Girardeau in November |
| December | 8° / 1° | 6 | 22 | 3 | 126 mm | Bad | Cape Girardeau in December |