June in Dubuque averages a daily high of 27.4°C with nights around 16°C. Expect roughly 12 wet days totalling 134.3mm. 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. 29 years of June data.