Haderslev, Denmark offers 6 beaches perfect for sunbathing, surfing, swimming, and more. Haderslev is known for its historic Haderslev Cathedral and the picturesque Haderslev Dampark. The best time to travel to Haderslev, Denmark, is from June to August, when the average air temperature is around 17°C (63°F) and the water temperature is approximately 16°C (61°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!