Phong Sek, Laos offers 1 beach perfect for sunbathing, surfing, swimming, and more. Phong Sek, Phongsaly, Laos, is known for the Phou Den Din National Protected Area and its rich cultural diversity with ethnic minority groups. The best time to travel to Phong Sek, Laos, is from November to February, with average air temperatures around 20-25°C (68-77°F) and water temperatures approximately 22-26°C (72-79°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!