September Beach is a white sand beach located within Lincoln National Park on the Cape Donington Peninsula, facing the Spencer Gulf. Access is via a 4WD track off the main park road, with the beach situated approximately 19 kilometers from the park entrance. The beach is known for its calm, aquamarine water, providing a generally sheltered paddling environment. A popular campground is located directly at the beach, offering convenient access for multi-day trips. The immediate area features a low, rocky coastline of granite boulders topped with limestone. From the water, paddlers have views of the operational Donington Lighthouse to the north and, in the distance, the silhouettes of large fishing boats and tuna pens within the Spencer Gulf, indicative of the region's aquaculture industry. The beach serves as a point on the Investigator Trail, and a short coastal walk or paddle around the rocky shoreline leads to a secluded bay only about 100 meters from the main beach. Dolphins and seals are known to frequent the area. The wider paddling area includes nearby features such as Spalding Cove, Surfleet Cove, and Carcase Rock, which can be explored by those seeking longer journeys. Wind protection can be found in the coves between September Beach and Surfleet Cove. As the beach is within a national park, visitors must hold a valid park entry permit. The campground includes glamping options at specific sites.