Khanthuli, Thailand offers 1 beach perfect for sunbathing, surfing, swimming, and more. Khanthuli, Surat Thani, Thailand, is known for its proximity to the stunning Ang Thong National Marine Park. The best time to travel to Khanthuli, Thailand, is from November to February, when the average air temperature is around 25-30°C (77-86°F) and the water temperature is approximately 28°C (82°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!