Sirenja, Indonesia offers 1 beach perfect for sunbathing, surfing, swimming, and more. Sirenja is known for its pristine beaches and vibrant marine life, making it a popular destination for beach tourism. The best time to travel to Sirenja, Indonesia, is from June to September, with average air temperatures around 28°C (82°F) and water temperatures near 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!