Delaware Seashore The main attraction for many visitors is swimming and sunbathing along the park's spectacular beaches. Two ocean swimming areas feature modern bathhouses with showers and changing rooms. Lifeguards patrol the beaches from 9 am to 5 pm daily between Memorial Day weekend and Labor Day.

Yes, Delaware beaches are excellent for swimming and are consistently ranked among the cleanest in the United States. In 2026, beaches like Rehoboth, Dewey, and Bethany have maintained their "5-star" water quality ratings from the Natural Resources Defense Council. The water is generally calm enough for families, although Dewey Beach is known for a steeper "shore break" that is popular with skimboarders but can be tricky for small children. The Atlantic water temperature in Delaware typically peaks in the mid-70s°F (24°C) in July and August, making it very comfortable for swimming. Additionally, almost all major public beaches in Delaware are guarded by professional lifesavers from Memorial Day through Labor Day. In 2026, travelers should be aware of "Sea Nettle" (jellyfish) season in late August, but otherwise, the state's coastline is considered a premier destination for safe, clean, and accessible ocean swimming on the East Coast.