Karainagar, Sri Lanka offers 5 beaches perfect for sunbathing, surfing, swimming, and more. Karainagar is known for the Casuarina Beach, a popular tourist destination in the Northern Province of Sri Lanka. The best time to travel to Karainagar, Sri Lanka, is from December to March, with average air temperatures around 27°C (81°F) and water temperatures near 28°C (82°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!