She reportedly told rescuers that she went for a midnight swim by herself and became disoriented as the nighttime current swept her adrift.
The woman, suffering from severe hypothermia, was described as having a gray skin tone due to her condition.
The victim was then rescued by the Los Angeles County Fire Department's lifeguards, who transported her to UCLA's Ronald Reagan Hospital.
He threw out a floatation device before using a buoy with a 70 feet cord on two attempts to rescue the unidentified woman.
Khosrow 'Koz' Khosravani, 60, happened to spot the woman's hand in the water while watching a pod of dolphins on September 26.
After 12 hours stuck at sea off the coast of Los Angeles, a woman was saved by a former UCLA lecturer who was just certified to sail.
Dolphin-watcher rescues a naked woman who survived for 12 HOURS in 66F water after she got 'disoriented on a night-time swim' and was swept three miles out to sea off LA