Wilhelmshaven, Germany offers 1 beach perfect for sunbathing, surfing, swimming, and more. Wilhelmshaven is known for the Deutsches Marinemuseum and the JadeWeserPort. The best time to travel to Wilhelmshaven, Germany, is from June to August, when the average air temperature is around 20°C (68°F) and the water temperature is approximately 17°C (63°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!