Maruthamunai, Sri Lanka offers 1 beach perfect for sunbathing, surfing, swimming, and more. Maruthamunai is known for its beautiful beaches and the nearby Kattankudy Heritage Museum. The best time to travel to Maruthamunai, 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!