Christmas Island, Australia offers 6 beaches perfect for sunbathing, surfing, swimming, and more. Christmas Island is known for its annual red crab migration. The best time to visit Christmas Island, Australia, is from May to October, when the average air temperature is around 27°C (81°F) and the water temperature is approximately 26°C (79°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!