September in Ames averages a daily high of 25.2°C with nights around 11°C. Expect roughly 8.9 wet days totalling 80.4mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Ames is September.
Based on AMES MUNICIPAL AIRPORT, IA US (4.9km), 1995–2024. 28 years of September data.