Swimming conditions at South End Beach vary with tides and currents typical of Georgia's barrier islands. The beach is undeveloped and remote, meaning there are no lifeguards on duty. Strong currents and riptides can occur, particularly during tidal changes. Wildlife including jellyfish and stingrays may be present seasonally. Since the island is largely uninhabited and far from medical facilities, visitors should exercise caution, swim in groups, and be experienced with ocean conditions before entering the water.

Spring (March-May) and fall (September-November) offer the most comfortable conditions with moderate temperatures, fewer insects, and pleasant weather for beach activities. Summer brings heat, humidity, and biting insects like sand gnats and mosquitoes. Winter can be mild but occasionally chilly for swimming. Since Ossabaw Island visits typically require advance planning and permits, weather is accessible year-round, though summer heat and bugs can be challenging without amenities or shelter on this undeveloped barrier island.