January in Ōsaki averages a daily high of 4.8°C. Expect roughly 6.1 wet days totalling 31.2mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Ōsaki is May–October.
Based on ISHINOMAKI, JA (33.3km), 1995–2024. 29 years of January data.