Haeundae Gu, South Korea offers 1 beach perfect for sunbathing, surfing, swimming, and more. Haeundae Gu is known for Haeundae Beach, Busan Aquarium, and Dongbaek Island. The best time to travel to Haeundae Gu, South Korea, is from late May to early October, with average air temperatures ranging from 20°C to 28°C and water temperatures from 18°C to 25°C. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!