Gdansk, Poland offers 7 beaches perfect for sunbathing, surfing, swimming, and more. Gdansk is known for its historic Old Town, the European Solidarity Centre, and the Westerplatte peninsula. The best time to travel to Gdansk, Poland, is from June to August, when the average air temperature is around 20°C (68°F) and the Baltic Sea water temperature is approximately 18°C (64°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!