Yes, you can absolutely swim in the sea at Punta Cana in 2026, though your experience may be influenced by Sargassum (seaweed) season, which typically peaks between May and August. During these months, ocean currents can bring large patches of brown seaweed to the Atlantic-facing beaches of the Bavaro strip. However, most high-end resorts now employ 24/7 cleaning crews and "seaweed barriers" to keep the swimming areas clear. For a "seaweed-free" guarantee, many travelers take day trips to Saona Island or Catalina Island, where the south-facing shores remain crystal clear year-round. Even on "heavy" seaweed days, the water itself is safe and clean; it is simply the physical presence of the plants on the shoreline that can be a nuisance. If you prefer calm, pool-like conditions, the beaches in the Cap Cana area offer more protected waters. In the winter months (December to March), the seaweed is virtually non-existent, and the water is at its most turquoise and "postcard-perfect" temperature of around 80°F, making it the ideal time for snorkeling and swimming directly from your resort’s beach.