Ag Petros, Greece offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Ag Petros is known for its proximity to the iconic beaches and historical sites of the South Aegean region. The best time to travel to Ag Petros, Greece, is from late May to early October, 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!