Ustronie, Poland offers 1 beach perfect for sunbathing, surfing, swimming, and more. Ustronie, West Pomeranian Voivodeship, Poland, is known for its proximity to the Baltic Sea and the popular tourist destination of Kolobrzeg. The best time to travel to Ustronie, 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 18-20°C (64-68°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!