Ishikari, Japan offers 8 beaches perfect for sunbathing, surfing, swimming, and more. Ishikari is known for the Ishikari River, Ishikari Bay, and the Ishikari Lighthouse. The best time to travel to Ishikari, Japan, is in late spring (May), when the average air temperature is around 15°C (59°F) and the water temperature is approximately 10°C (50°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!