Phru Nai, Thailand offers 4 beaches perfect for sunbathing, surfing, swimming, and more. Phru Nai, Phang Nga, Thailand, is known for the stunning Similan Islands, a popular destination for diving and snorkeling enthusiasts. The best time to travel to Phru Nai, 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!