March in Oak Lawn averages a daily high of 8.9°C with nights around 0°C. Expect roughly 11.2 wet days totalling 69.1mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Oak Lawn is August–September.
Based on CHICAGO MIDWAY AIRPORT 3 SW, IL US (3.3km), 1995–2024. 30 years of March data.