Omisalj, Croatia offers 20 beaches perfect for sunbathing, surfing, swimming, and more. Omisalj is known for its historic old town and the nearby Rijeka Airport. The best time to travel to Omisalj, Croatia, is from June to September, with average air temperatures around 75°F (24°C) and water temperatures around 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!