Knokke Heist, Belgium offers 5 beaches perfect for sunbathing, surfing, swimming, and more. Knokke Heist is known for its Zwin Nature Park, the Casino Knokke, and the annual International Fireworks Festival. The best time to travel to Knokke-Heist, Belgium, is from June to August, when the average air temperature is around 20°C (68°F) and the water temperature is approximately 18°C (64°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!