Posedarje, Croatia offers 8 beaches perfect for sunbathing, surfing, swimming, and more. Posedarje, Lika Senj, Croatia, is known for its proximity to the Paklenica National Park and the Velebit Mountain range. The best time to travel to Posedarje, Croatia, is from June to September, when the average air temperature is around 75°F (24°C) and the sea temperature is approximately 75°F (24°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!