April in Kamisu averages a daily high of 16.8°C with nights around 10.9°C. Expect roughly 12.1 wet days totalling 131.6mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Kamisu is May–October.
Based on CHOSHI, JA (24.6km), 1995–2024. 16 years of April data.