April in Iowa City averages a daily high of 16.7°C with nights around 4°C. Expect roughly 10.9 wet days totalling 89.1mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Iowa City is August–October.
Based on IOWA CITY MUNICIPAL AIRPORT, IA US (2.7km), 1995–2024. 29 years of April data.