Ashiya, Japan offers 4 beaches perfect for sunbathing, surfing, swimming, and more. Ashiya is known for the Ashiya Seaside Park and the Ashiya Beach in regard to tourism. The best time to travel to Ashiya, Japan, is in April when the average air temperature is around 15°C (59°F) and the 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!