Tambon Sanamchai, Thailand offers 1 beach perfect for sunbathing, surfing, swimming, and more. Tambon Sanamchai, Chanthaburi, Thailand, is known for its vibrant gem markets and rich gemstone mining history. The best time to travel to Tambon Sanamchai, 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!