Conca dei Marini, Italy offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Conca dei Marini is known for the Grotta dello Smeraldo, a stunning sea cave with emerald waters. The best time to travel to Conca dei Marini, Italy, is from May to September, with average air temperatures around 75°F (24°C) and water temperatures around 73°F (23°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!