Karystos, Greece offers 1 beach perfect for sunbathing, surfing, swimming, and more. Karystos, Thessaly And Central Greece, Greece, is known for the ancient Dragon Houses and the Venetian-era Castello Rosso. The best time to travel to Karystos, Greece, is from May to September, with average air temperatures ranging from 70°F to 85°F and water temperatures from 70°F to 77°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!