Kosakowo, Poland offers 1 beach perfect for sunbathing, surfing, swimming, and more. Kosakowo is known for its proximity to the Open'er Festival, one of Poland's largest music festivals. The best time to travel to Kosakowo, Poland, is during the summer months of June to August, when the average air temperature is around 18-22°C (64-72°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!