Kionia, Greece offers 1 beach perfect for sunbathing, surfing, swimming, and more. Kionia is known for its beautiful beaches and the ancient Temple of Poseidon. The best time to travel to Kionia, 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!