April in Arlington Heights averages a daily high of 14.7°C with nights around 3.8°C. Expect roughly 11.3 wet days totalling 78.9mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Arlington Heights is May–September.
Based on CHICAGO PALWAUKEE AIRPORT, IL US (7.2km), 1995–2024. 28 years of April data.