Monterol, Croatia offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Monterol is known for its proximity to the renowned tourist destination of Umag in Istria, Croatia. The best time to travel to Monterol, 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!