Ko Phai, Thailand offers 1 beach perfect for sunbathing, surfing, swimming, and more. Ko Phai, Chon Buri, Thailand, is known for its pristine beaches and vibrant marine life, making it a popular destination for snorkeling and diving enthusiasts. The best time to travel to Ko Phai, Thailand, is from November to February, with average air temperatures around 25-30°C (77-86°F) and water temperatures about 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!