Sinji myeon, South Korea offers 1 beach perfect for sunbathing, surfing, swimming, and more. Sinji myeon, Jeollanam do, South Korea, is known for its beautiful Sinji Myeongsasimni Beach and the Sinan Tulip Festival. The best time to travel to Sinji-myeon, 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 17-20°C (63-68°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!