Santee, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Santee is known for Lake Marion, Santee State Park, and the Santee National Wildlife Refuge. The best time to travel to Santee, United States, is in the spring (March to May) when the average air temperature is around 70°F (21°C) and water temperature is approximately 65°F (18°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!