April in Dubuque averages a daily high of 14.7°C with nights around 3.6°C. Expect roughly 11.3 wet days totalling 94.3mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Dubuque is August–September.
Based on DUBUQUE LOCK AND DAM 11, IA US (4.6km), 1995–2024. 30 years of April data.