Agia Kiriaki, Greece offers 1 beach perfect for sunbathing, surfing, swimming, and more. Agia Kiriaki, Peloponnese, Greece, is known for its proximity to the ancient site of Mycenae. The best time to travel to Agia Kiriaki, Greece, is from late May to early October, with average air temperatures ranging from 75°F to 85°F and water temperatures around 72°F to 78°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!