June in Duluth averages a daily high of 20.1°C with nights around 10°C. Expect roughly 11.2 wet days totalling 109.5mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Duluth is June–September.
Based on SUPERIOR, WI US (6.8km), 1995–2024. 27 years of June data.