Yanai, Japan offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Yanai is known for its historic Shirakabe Street, featuring traditional white-walled merchant houses. The best time to travel to Yanai, Japan, is in April when the average air temperature is around 15°C (59°F) and the average water temperature is approximately 16°C (61°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!