Grenaa, Denmark offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Grenaa, Hovedstaden, Denmark, is known for the Kattegatcentret aquarium and the scenic Grenaa Beach. The best time to travel to Grenaa, Denmark, is during the summer months of June to August, when the average air temperature is around 17-20°C (63-68°F) and the water temperature is approximately 16-18°C (61-64°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!