Don Sak, Thailand offers 1 beach perfect for sunbathing, surfing, swimming, and more. Don Sak is known for being the gateway to the popular tourist destinations of Koh Samui, Koh Phangan, and Koh Tao. The best time to travel to Don Sak, Thailand, is from December to February, with average air temperatures around 27°C (81°F) and water temperatures near 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!