Grignano, Italy offers 1 beach perfect for sunbathing, surfing, swimming, and more. Grignano is known for the Miramare Castle, a 19th-century castle with stunning views of the Gulf of Trieste. The best time to travel to Grignano, Italy, is from May to September, when the average air temperature ranges from 70°F to 80°F and the water temperature is around 70°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!