Sundays River Mouth Beach offers swimming opportunities, though conditions vary depending on tides, river flow, and weather. The river mouth area can have currents where fresh and salt water meet, so caution is advised. The broad sandy beach provides space for safer swimming away from the direct mouth. There are typically no lifeguards, so visitors should assess conditions carefully and never swim alone. Families should supervise children closely, especially near the river channel. Calmer days and areas away from the main current provide the safest swimming conditions.

Sundays River Mouth Beach is most popular during South African school holidays when local families use it for vacations, though it remains relatively uncrowded compared to major tourist beaches. Summer months (November to March) offer the warmest weather for beach activities. For fewer crowds, visit during weekdays or shoulder seasons in autumn and spring. The beach's scenic dune landscape is beautiful year-round for walks and photography. Sunset viewing is particularly attractive here, making late afternoons worthwhile. Early mornings provide peaceful moments to enjoy the river-mouth environment.