Rosklide, Denmark offers 1 beach perfect for sunbathing, surfing, swimming, and more. Roskilde is known for the Roskilde Festival, Roskilde Cathedral, and the Viking Ship Museum. The best time to travel to Roskilde, Denmark, is from June to August, when the average air temperature is around 20°C (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!