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January in Jōsō averages a daily high of 10.1°C. Expect roughly 4.5 wet days totalling 44.9mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Jōsō is April–June.
Based on TOKYO, JA (42.9km), 1995–2024. 23 years of January data.
See all twelve months for Jōsō →