Ansedonia, Italy offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Ansedonia is known for the ancient Roman ruins of Cosa and its beautiful coastal views. The best time to travel to Ansedonia, Italy, is from May to September, when the average air temperature is around 75°F (24°C) and the water temperature is approximately 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!