May in Davenport averages a daily high of 22.6°C with nights around 11.9°C. Expect roughly 13.2 wet days totalling 131.1mm. Generally workable, with some weather to plan around.
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 May data.