Gdynia, Poland offers 9 beaches perfect for sunbathing, surfing, swimming, and more. Gdynia is known for its annual Gdynia Film Festival and the Emigration Museum. The best time to travel to Gdynia, Poland, is from June to August, with average air temperatures around 20°C (68°F) and water temperatures around 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!