Piraeus, Greece offers 1 beach perfect for sunbathing, surfing, swimming, and more. Fort Erie is known for the historic Old Fort Erie and the scenic Niagara River Parkway. The best time to travel to Piraeus, Greece, is from May to September, with average air temperatures around 75-85°F (24-29°C) and water temperatures ranging from 72-79°F (22-26°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!