September in Schaumburg averages a daily high of 22.9°C with nights around 12.4°C. Expect roughly 9.6 wet days totalling 90.4mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Schaumburg is June–September.
Based on BARRINGTON 3 SW, IL US (11.3km), 1995–2024. 25 years of September data.