Posidonia, Greece offers 5 beaches perfect for sunbathing, surfing, swimming, and more. Posidonia, South Aegean, Greece, is known for its beautiful beaches and the historic Church of Agios Ioannis. The best time to travel to Posidonia, Greece, is from late May to early October, with average air temperatures around 75°F (24°C) and water temperatures near 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!
