Seline, Croatia offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Seline, Zadar, Croatia, is known for its proximity to Paklenica National Park, a popular destination for hiking and rock climbing. The best time to travel to Seline, Croatia, is from June to September, with average air temperatures around 75°F (24°C) and water temperatures around 72°F (22°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!