Holbaek, Denmark offers 5 beaches perfect for sunbathing, surfing, swimming, and more. Holbaek is known for the Holbaek Museum and the scenic Isefjord. The best time to travel to Holbaek, 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 17°C (63°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!