Serangoon Island, Singapore offers 1 beach perfect for sunbathing, surfing, swimming, and more. Serangoon Island, North East Region, Singapore, is known for Coney Island Park. The best time to travel to Serangoon 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!