Boryeong si, South Korea offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Boryeong is known for the Boryeong Mud Festival. The best time to travel to Boryeong-si, South Korea, is during the Boryeong Mud Festival in July, when the average air temperature is around 25°C (77°F) and the sea temperature is approximately 23°C (73°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!