July in Iowa City averages a daily high of 29.5°C with nights around 18.3°C. Expect roughly 9.1 wet days totalling 91.2mm. 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 July data.