Donja Lastva, Montenegro offers 4 beaches perfect for sunbathing, surfing, swimming, and more. Donja Lastva, Tivat, Montenegro, is known for its proximity to Porto Montenegro, a luxury marina and yachting paradise. The best time to travel to Donja Lastva, Montenegro, is from June to September, with average air temperatures around 25°C (77°F) and water temperatures about 24°C (75°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!