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The temperatures in Iowa in September are comfortable with low of 13°C and and high up to 25°C.
You can expect about 3 to 8 days of rain in Iowa 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 Iowa in September 2025.
If you’re planning to visit Iowa in the near future, we highly recommend that you review the 14 day weather forecast for Iowa before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -2° / -9° | 3 | 16 | 12 | 44 mm | Awful | Iowa in January |
| February | -1° / -8° | 2 | 15 | 11 | 54 mm | Awful | Iowa in February |
| March | 9° / 1° | 7 | 18 | 6 | 103 mm | Awful | Iowa in March |
| April | 15° / 6° | 8 | 20 | 2 | 137 mm | Bad | Iowa in April |
| May | 21° / 12° | 9 | 22 | 0 | 218 mm | Ok | Iowa in May |
| June | 27° / 17° | 9 | 21 | 0 | 208 mm | Good | Iowa in June |
| July | 28° / 18° | 7 | 24 | 0 | 126 mm | Good | Iowa in July |
| August | 28° / 17° | 7 | 24 | 0 | 157 mm | Good | Iowa in August |
| September | 25° / 13° | 6 | 24 | 0 | 128 mm | Perfect | Iowa in September |
| October | 17° / 7° | 5 | 25 | 1 | 97 mm | Good | Iowa in October |
| November | 9° / 1° | 4 | 23 | 3 | 71 mm | Bad | Iowa in November |
| December | 2° / -5° | 3 | 19 | 8 | 56 mm | Awful | Iowa in December |