April in Oak Park averages a daily high of 15.7°C with nights around 5.4°C. Expect roughly 11.9 wet days totalling 88.3mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Oak Park is May–June.
Based on CHICAGO MIDWAY AIRPORT, IL US (11.5km), 1995–2024. 27 years of April data.