Click on a day for an hourly weather forecast
The temperatures in Milwaukee in September are comfortable with low of 15°C and and high up to 21°C.
You can expect about 3 to 8 days of rain in Milwaukee 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 Milwaukee in September 2025.
If you’re planning to visit Milwaukee in the near future, we highly recommend that you review the 14 day weather forecast for Milwaukee before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -3° / -8° | 5 | 9 | 17 | 49 mm | Awful | Milwaukee in January |
| February | -2° / -7° | 4 | 10 | 15 | 48 mm | Awful | Milwaukee in February |
| March | 4° / -1° | 6 | 17 | 8 | 60 mm | Awful | Milwaukee in March |
| April | 9° / 3° | 7 | 19 | 4 | 109 mm | Awful | Milwaukee in April |
| May | 15° / 9° | 7 | 24 | 0 | 118 mm | Ok | Milwaukee in May |
| June | 21° / 14° | 6 | 24 | 0 | 138 mm | Good | Milwaukee in June |
| July | 24° / 19° | 6 | 25 | 0 | 140 mm | Perfect | Milwaukee in July |
| August | 25° / 18° | 5 | 26 | 0 | 120 mm | Perfect | Milwaukee in August |
| September | 21° / 15° | 5 | 25 | 0 | 87 mm | Good | Milwaukee in September |
| October | 14° / 9° | 6 | 24 | 1 | 97 mm | Good | Milwaukee in October |
| November | 7° / 2° | 5 | 19 | 6 | 52 mm | Bad | Milwaukee in November |
| December | 1° / -3° | 5 | 13 | 13 | 48 mm | Awful | Milwaukee in December |