Ko Siboya, Thailand offers 11 beaches perfect for sunbathing, surfing, swimming, and more. Ko Siboya is known for its tranquil beaches and traditional Thai village life. The best time to travel to Ko Siboya, Thailand, is from November to February, with average air temperatures around 28°C (82°F) and water temperatures around 27°C (81°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!