May in Schaumburg averages a daily high of 20.3°C with nights around 9.3°C. Expect roughly 14 wet days totalling 131.3mm. Generally workable, with some weather to plan around.
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 May data.