Pireas, Greece offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Pireas is known for its bustling port, the Port of Piraeus, which serves as a major gateway to the Greek islands. The best time to travel to Pireas, Greece, is from May to September, with average air temperatures ranging from 70°F to 85°F and water temperatures from 70°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!