Loosduinen, Netherlands offers 1 beach perfect for sunbathing, surfing, swimming, and more. Loosduinen, The Hague, Netherlands, is known for the historic Loosduinen Abbey and the picturesque Madestein Park. The best time to travel to Loosduinen, Netherlands, is from June to August, with average air temperatures around 18-22°C (64-72°F) and North Sea water temperatures near 17-20°C (63-68°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!