Caska, Croatia offers 1 beach perfect for sunbathing, surfing, swimming, and more. Caska, Lika Senj, Croatia, is known for its proximity to the ancient Roman ruins and the beautiful beaches of Pag Island. The best time to travel to Caska, Croatia, is from June to September, when the average air temperature is around 75°F (24°C) and the water temperature is approximately 73°F (23°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!