January in Oak Lawn averages a daily high of 0.4°C with nights around -6.9°C. Expect roughly 11.8 wet days totalling 58.4mm. A hard month to visit for comfort alone.
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 January data.