Monolithos, Greece offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Monolithos, South Aegean, Greece, is known for the Monolithos Castle, a medieval fortress offering panoramic views of the Aegean Sea. The best time to travel to Monolithos, Greece, is from May to September, with average air temperatures ranging from 75°F to 85°F and water temperatures from 72°F to 79°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!