January in Yotsuya 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 Yotsuya is April–June.
Based on TOKYO, JA (4.6km), 1995–2024. 23 years of January data.