July in Des Moines averages a daily high of 30.2°C with nights around 19.6°C. Expect roughly 8.8 wet days totalling 94mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Des Moines is September.
Based on DES MOINES INTERNATIONAL AIRPORT, IA US (8.3km), 1995–2024. 30 years of July data.