Promajna, Croatia offers 1 beach perfect for sunbathing, surfing, swimming, and more. Promajna is known for its beautiful beaches along the Adriatic Sea and its proximity to the Biokovo Nature Park. The best time to travel to Promajna, Croatia, is from June to September, with average air temperatures around 25-30°C (77-86°F) and water temperatures around 23-26°C (73-79°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!