Principina a Mare, Italy offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Principina a Mare is known for its serene beaches and natural beauty in the Maremma region of Tuscany. The best time to travel to Principina a Mare, Italy, is from late May to early September, when the average air temperature ranges from 25°C to 30°C (77°F to 86°F) and the average sea temperature is around 23°C to 26°C (73°F to 79°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!