Trieste, Italy offers 9 beaches perfect for sunbathing, surfing, swimming, and more. Trieste is known for its historic coffeehouses, the Miramare Castle, and the Piazza Unita d'Italia. The best time to travel to Trieste, Italy, is from May to September, with average air temperatures ranging from 20-28°C (68-82°F) and water temperatures around 22-25°C (72-77°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!