March in Ōshū averages a daily high of 9.6°C. Expect roughly 8.9 wet days totalling 108.8mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Ōshū is May–June.
Based on OFUNATO, JA (48km), 1995–2024. 24 years of March data.