Click on a day for an hourly weather forecast
The temperatures in Champaign in September are comfortable with low of 15°C and and high up to 25°C.
You can expect about 3 to 8 days of rain in Champaign 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 Champaign in September 2025.
If you’re planning to visit Champaign in the near future, we highly recommend that you review the 14 day weather forecast for Champaign before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 0° / -6° | 6 | 13 | 12 | 60 mm | Awful | Champaign in January |
| February | 2° / -5° | 4 | 14 | 11 | 61 mm | Awful | Champaign in February |
| March | 10° / 2° | 7 | 20 | 5 | 84 mm | Awful | Champaign in March |
| April | 16° / 7° | 7 | 21 | 2 | 118 mm | Bad | Champaign in April |
| May | 22° / 13° | 8 | 23 | 0 | 127 mm | Ok | Champaign in May |
| June | 27° / 18° | 7 | 23 | 0 | 127 mm | Good | Champaign in June |
| July | 27° / 19° | 6 | 25 | 0 | 104 mm | Perfect | Champaign in July |
| August | 27° / 18° | 5 | 26 | 0 | 93 mm | Perfect | Champaign in August |
| September | 25° / 15° | 4 | 26 | 0 | 71 mm | Perfect | Champaign in September |
| October | 17° / 9° | 5 | 26 | 0 | 93 mm | Good | Champaign in October |
| November | 10° / 3° | 5 | 22 | 3 | 69 mm | Bad | Champaign in November |
| December | 4° / -2° | 5 | 18 | 8 | 61 mm | Awful | Champaign in December |