Trincomalee, Sri Lanka offers 16 beaches perfect for sunbathing, surfing, swimming, and more. Trincomalee is known for its stunning natural harbor, the ancient Koneswaram Temple, and the beautiful beaches of Nilaveli and Uppuveli. The best time to travel to Trincomalee, Sri Lanka, is from May to September, with average air temperatures around 28-32°C (82-90°F) and water temperatures around 27-29°C (81-84°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!