Kaiyo, Japan offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Kaiyo, Shikoku, Japan, is known for the Muroto-Anan Kaigan Quasi-National Park and the scenic views of the Pacific Ocean. The best time to travel to Kaiyo, Japan, is from May to October, with average air temperatures ranging from 20°C to 28°C and water temperatures from 20°C to 26°C. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!