March in Wheaton averages a daily high of 8.7°C with nights around -2.2°C. Expect roughly 9.7 wet days totalling 51.1mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Wheaton is May–June.
Based on CHICAGO WEST CHICAGO DUPAGE AIRPORT, IL US (12.4km), 1995–2024. 27 years of March data.