Hwasunhaean ro, South Korea offers 1 beach perfect for sunbathing, surfing, swimming, and more. Jeju do is known for Hallasan Mountain, Seongsan Ilchulbong, and Jeju Loveland. The best time to travel to Hwasunhaean ro, South Korea, is in late spring (May to June) when the average air temperature is around 20-25°C (68-77°F) and the water temperature is approximately 16-20°C (61-68°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!