June in Waukegan averages a daily high of 24.8°C with nights around 13.7°C. Expect roughly 11.4 wet days totalling 104.3mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Waukegan is May–September.
Based on CHICAGO WAUKEGAN REGIONAL AIRPORT, IL US (7.1km), 1995–2024. 25 years of June data.