Saint John's Island, Singapore offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Saint John's Island is known for its serene beaches, lush greenery, and the Lazarus Island connection. The best time to visit Saint John's Island, Singapore, is from February to April, 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!