September in Des Moines averages a daily high of 25.5°C with nights around 13.7°C. Expect roughly 7.5 wet days totalling 74.6mm. Comfortable conditions for being outdoors all day.
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 September data.