Click on a day for an hourly weather forecast
The temperatures in Rockford in September are comfortable with low of 12°C and and high up to 23°C.
You can expect about 3 to 8 days of rain in Rockford 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 Rockford in September 2025.
If you’re planning to visit Rockford in the near future, we highly recommend that you review the 14 day weather forecast for Rockford before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -4° / -10° | 4 | 13 | 15 | 30 mm | Awful | Rockford in January |
| February | -2° / -9° | 3 | 13 | 13 | 33 mm | Awful | Rockford in February |
| March | 7° / -1° | 6 | 19 | 6 | 43 mm | Bad | Rockford in March |
| April | 13° / 4° | 6 | 21 | 3 | 68 mm | Bad | Rockford in April |
| May | 20° / 10° | 7 | 24 | 0 | 92 mm | Ok | Rockford in May |
| June | 25° / 15° | 6 | 24 | 0 | 99 mm | Perfect | Rockford in June |
| July | 26° / 17° | 5 | 26 | 0 | 76 mm | Perfect | Rockford in July |
| August | 26° / 16° | 5 | 26 | 0 | 66 mm | Perfect | Rockford in August |
| September | 23° / 12° | 3 | 27 | 0 | 44 mm | Perfect | Rockford in September |
| October | 15° / 7° | 4 | 26 | 1 | 54 mm | Good | Rockford in October |
| November | 7° / 0° | 4 | 22 | 4 | 34 mm | Bad | Rockford in November |
| December | 1° / -5° | 5 | 15 | 11 | 32 mm | Awful | Rockford in December |