Konan, Japan offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Konan, Shikoku, Japan, is known for the Ryugado Cave, a famous limestone cave that attracts many tourists. The best time to travel to Konan, 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!