Click on a day for an hourly weather forecast
The temperatures in Cedar Rapids in September are comfortable with low of 13°C and and high up to 24°C.
You can expect about 3 to 8 days of rain in Cedar Rapids 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 Cedar Rapids in September 2025.
If you’re planning to visit Cedar Rapids in the near future, we highly recommend that you review the 14 day weather forecast for Cedar Rapids before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -4° / -10° | 4 | 12 | 15 | 59 mm | Awful | Cedar Rapids in January |
| February | -2° / -9° | 3 | 12 | 13 | 69 mm | Awful | Cedar Rapids in February |
| March | 7° / 0° | 7 | 17 | 8 | 106 mm | Awful | Cedar Rapids in March |
| April | 14° / 5° | 9 | 19 | 3 | 165 mm | Bad | Cedar Rapids in April |
| May | 20° / 11° | 11 | 20 | 0 | 231 mm | Ok | Cedar Rapids in May |
| June | 26° / 16° | 10 | 20 | 0 | 240 mm | Good | Cedar Rapids in June |
| July | 27° / 18° | 8 | 23 | 0 | 158 mm | Good | Cedar Rapids in July |
| August | 27° / 17° | 5 | 26 | 0 | 132 mm | Perfect | Cedar Rapids in August |
| September | 24° / 13° | 6 | 24 | 0 | 118 mm | Perfect | Cedar Rapids in September |
| October | 16° / 7° | 7 | 23 | 1 | 121 mm | Ok | Cedar Rapids in October |
| November | 8° / 0° | 5 | 21 | 4 | 87 mm | Bad | Cedar Rapids in November |
| December | 1° / -5° | 4 | 16 | 11 | 74 mm | Awful | Cedar Rapids in December |