Piaseczno, Poland offers 1 beach perfect for sunbathing, surfing, swimming, and more. Piaseczno, Warminsko Mazurskie, Poland, is known for its proximity to the Masurian Lake District, a popular destination for nature enthusiasts and water sports. The best time to travel to Piaseczno, Poland, is from June to August, with average air temperatures around 20-25°C (68-77°F) and water temperatures in nearby lakes around 18-22°C (64-72°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!