Kushima, Japan offers 4 beaches perfect for sunbathing, surfing, swimming, and more. Kushima, Kyushu, Japan, is known for the Cape Toi and its wild horses. The best time to travel to Kushima, Japan, is in April when the average air temperature is around 17°C (63°F) and the water temperature is approximately 18°C (64°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!