Weather in Waukesha in September
How warm is it in Waukesha in September?
In September the typical daytime high in Waukesha is 23.7 °C on average, from 26.0 °C at the start to 20.8 °C at the end of the month.
That is 3.5 °C cooler than in August and 7.4 °C warmer than in October.
The last 10 years were 2.3 °C warmer than more than 40 years ago.
Click a day for more: afternoon and night, the usual range, records and how fast it is warming.
The average of the weather stations Green Bay (166 km), Rock Is L&D (254 km) and Cedar Rapids (295 km); nearer ones count more.