Yonp'o haesuyokchang, South Korea offers 1 beach perfect for sunbathing, surfing, swimming, and more. Yonpo Haesuyokchang, Chungcheongnam do, South Korea, is known for its Yonpo Beach, a popular destination for its scenic coastline and recreational activities. The best time to travel to Yonp'o haesuyokchang, South Korea, is from June to August, with average air temperatures around 75°F (24°C) and water temperatures near 72°F (22°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!