Grad Rovinj, Croatia offers 21 beaches perfect for sunbathing, surfing, swimming, and more. Grad Rovinj, Istria, Croatia, is known for its picturesque Old Town, St. Euphemia's Basilica, and the vibrant Rovinj Archipelago. The best time to travel to Grad Rovinj, Croatia, is from May to September, when the average air temperature is around 70-80°F (21-27°C) and the water temperature is approximately 70-75°F (21-24°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!