Heist, Belgium offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Heist, Vlaams Gewest, Belgium, is known for its beautiful sandy beaches and the annual Heistse Pijl cycling race. The best time to travel to Heist, Belgium, 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!