December in Ishinomaki averages a daily high of 7.4°C. Expect roughly 7.3 wet days totalling 53mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Ishinomaki is May–October.
Based on ISHINOMAKI, JA (1.8km), 1995–2024. 27 years of December data.