Yamaguchi, Japan offers 4 beaches perfect for sunbathing, surfing, swimming, and more. Yamaguchi is known for Rurikoji Temple, Akiyoshido Cave, and the Kintai Bridge. The best time to travel to Yamaguchi, 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!