July in Waukesha averages a daily high of 27.9°C with nights around 16.2°C. Expect roughly 8.6 wet days totalling 94.6mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Waukesha is June–September.
Based on WAUKESHA WWTP, WI US (2.2km), 1995–2024. 20 years of July data.