September in Bolingbrook averages a daily high of 24.8°C with nights around 13.4°C. Expect roughly 8.3 wet days totalling 81.7mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Bolingbrook is August–September.
Based on ROMEOVILLE WEATHER FORECAST OFFICE, IL US (10.6km), 1995–2024. 28 years of September data.