June in Naperville averages a daily high of 27.2°C with nights around 15.2°C. Expect roughly 11.4 wet days totalling 110.1mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Naperville is August–September.
Based on AURORA WATER, IL US (13.4km), 1995–2024. 30 years of June data.