Jantar, Poland offers 4 beaches perfect for sunbathing, surfing, swimming, and more. Jantar is known for its annual International Amber Gathering and the beautiful beaches along the Baltic Sea. The best time to travel to Jantar, 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!