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December in Kosai averages a daily high of 12.8°C. Expect roughly 5.3 wet days totalling 68.7mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Kosai is April–June.
Based on HAMAMATSU, JA (17.9km), 1995–2024. 27 years of December data.
See all twelve months for Kosai →