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December in Kōshi averages a daily high of 12.8°C. Expect roughly 8.4 wet days totalling 61.7mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Kōshi is April–May.
Based on KUMAMOTO, JA (11.1km), 1995–2024. 27 years of December data.
See all twelve months for Kōshi →