Click on a day for an hourly weather forecast
The temperatures in Wausau in September are usually low and can range between 10°C and 20°C.
You can expect about 3 to 8 days of rain in Wausau 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 Wausau in September 2025.
If you’re planning to visit Wausau in the near future, we highly recommend that you review the 14 day weather forecast for Wausau before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -7° / -14° | 3 | 7 | 21 | 27 mm | Awful | Wausau in January |
| February | -6° / -13° | 2 | 7 | 19 | 31 mm | Awful | Wausau in February |
| March | 3° / -5° | 6 | 12 | 14 | 50 mm | Awful | Wausau in March |
| April | 9° / 0° | 7 | 15 | 8 | 71 mm | Awful | Wausau in April |
| May | 18° / 7° | 7 | 24 | 1 | 86 mm | Ok | Wausau in May |
| June | 22° / 12° | 6 | 24 | 0 | 99 mm | Good | Wausau in June |
| July | 25° / 15° | 5 | 27 | 0 | 64 mm | Perfect | Wausau in July |
| August | 25° / 14° | 4 | 27 | 0 | 56 mm | Perfect | Wausau in August |
| September | 20° / 10° | 3 | 27 | 0 | 51 mm | Good | Wausau in September |
| October | 12° / 4° | 5 | 22 | 3 | 67 mm | Bad | Wausau in October |
| November | 4° / -3° | 4 | 16 | 10 | 48 mm | Awful | Wausau in November |
| December | -4° / -9° | 4 | 10 | 17 | 39 mm | Awful | Wausau in December |