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April in Kosai averages a daily high of 20°C. Expect roughly 10.3 wet days totalling 193mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Kosai is April–June.
Based on HAMAMATSU, JA (17.9km), 1995–2024. 27 years of April data.
See all twelve months for Kosai →