March in Duluth averages a daily high of 2.6°C with nights around -5.9°C. Expect roughly 6.9 wet days totalling 40.3mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Duluth is June–September.
Based on SUPERIOR, WI US (6.8km), 1995–2024. 28 years of March data.