Wassenaar, Netherlands offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Wassenaar is known for Duinrell amusement park and the royal estate of De Horsten. The best time to travel to Wassenaar, Netherlands, is from June to August, with average air temperatures around 18-22°C (64-72°F) and water temperatures around 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!