May in Ankeny averages a daily high of 22.2°C with nights around 9.5°C. Expect roughly 12.2 wet days totalling 133.3mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Ankeny is September–October.
Based on ANKENY, IA US (3.7km), 1995–2024. 23 years of May data.