Margaret Knoll, Christmas Island offers 1 beach perfect for sunbathing, surfing, swimming, and more. Christmas Island is known for its annual red crab migration and the natural beauty of Margaret Knoll. The best time to travel to Margaret Knoll, Christmas Island, is from May to October, with average air temperatures around 27°C (81°F) and water temperatures near 28°C (82°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!