Onrusrivier, South Africa offers 1 beach perfect for sunbathing, surfing, swimming, and more. Onrusrivier is known for its beautiful beaches and vibrant art scene. The best time to travel to Onrusrivier, South Africa, is from December to February, with average air temperatures around 25°C (77°F) and water temperatures around 20°C (68°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!