Mielenko Kolonia, Poland offers 1 beach perfect for sunbathing, surfing, swimming, and more. Mielenko Kolonia is known for its proximity to the Baltic Sea and the scenic beaches of Mielno. The best time to travel to Mielenko Kolonia, Poland, is during the summer months of June to August, when the average air temperature is around 20-25°C (68-77°F) and the Baltic Sea water temperature is approximately 17-20°C (63-68°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!