Siloso Beach Island, Singapore offers 1 beach perfect for sunbathing, surfing, swimming, and more. Siloso Beach Island, South West Region, Singapore, is known for its vibrant Siloso Beach, Adventure Cove Waterpark, and the iconic Sentosa Island attractions. The best time to visit Siloso Beach Island, Singapore, is from December to June, with average air temperatures around 27-31°C (81-88°F) and water temperatures around 28-30°C (82-86°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!