March in Nagaoka averages a daily high of 10.2°C. Expect roughly 15.6 wet days totalling 102.8mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Nagaoka is May–June.
Based on NIIGATA, JA (54.8km), 1995–2024. 21 years of March data.