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.
Temperatures
21° / 15°
Rainy Days
5
Snowy Days
0
Dry Days
25
Rainfall
87
mm
Sun Hours
10.6
Hrs