Tha Ngon, Laos offers 1 beach perfect for sunbathing, surfing, swimming, and more. Tha Ngon, Vientiane, Laos, is known for the Nam Ngum River, which offers scenic boat tours and riverside dining experiences. The best time to travel to Tha Ngon, Laos, is from November to February, with average air temperatures around 25°C (77°F) and water temperatures near 24°C (75°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!