Koksijde, Belgium offers 5 beaches perfect for sunbathing, surfing, swimming, and more. Koksijde is known for its beautiful sandy beaches and the historic Ten Duinen Abbey Museum. The best time to travel to Koksijde, Belgium, is from June to August, when the average air temperature is around 18-22°C (64-72°F) and the North Sea water temperature is approximately 17-19°C (63-66°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!