Eforie Sud, Romania offers 6 beaches perfect for sunbathing, surfing, swimming, and more. Eforie Sud, Constanta, Romania, is known for its therapeutic mud treatments from Lake Techirghiol. The best time to travel to Eforie Sud, Romania, is from June to August, when the average air temperature is around 25°C (77°F) and the water temperature is approximately 23°C (73°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!