September in Davenport averages a daily high of 25.5°C with nights around 14.4°C. Expect roughly 7.8 wet days totalling 79.9mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Davenport is August–September.
Based on ROCK ISLAND LOCK AND DAM 15, IL US (1.2km), 1995–2024. 30 years of September data.