December in Yotsuya averages a daily high of 12.5°C. Expect roughly 6.2 wet days totalling 60.5mm. 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. 22 years of December data.