April in Duluth averages a daily high of 7.6°C with nights around -0.2°C. Expect roughly 9.4 wet days totalling 63.9mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Duluth is June–September.
Based on SUPERIOR, WI US (6.8km), 1995–2024. 27 years of April data.