Caspar, United States offers 6 beaches perfect for sunbathing, surfing, swimming, and more. Caspar, California, United States, is known for Jug Handle State Natural Reserve and the Caspar Headlands State Beach. The best time to travel to Caspar, United States, is from June to September, with average air temperatures around 60-70°F and water temperatures near 55-60°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!