Geoje si, South Korea offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Geoje si is known for Geoje Island, Oedo Botania, and the POW Camp Park. The best time to travel to Geoje-si, South Korea, is from late spring to early fall (May to September), with average air temperatures ranging from 20°C to 28°C (68°F to 82°F) and water temperatures from 18°C to 25°C (64°F to 77°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!