Syros and Ermoupoli, Greece offers 10 beaches perfect for sunbathing, surfing, swimming, and more. Syros and Ermoupoli, South Aegean, Greece, is known for its neoclassical architecture, the Apollo Theater, and the Miaouli Square. The best time to travel to Syros and Ermoupoli, Greece, is from late May to early October, with average air temperatures ranging from 75-85°F (24-29°C) and water temperatures around 72-77°F (22-25°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!