Gym Kho Kay, 32, passed away about 7pm, said a spokesperson for Vachira Phuket Hospital in Phuket City, where he had been on life support since being pulled from the surf at Karon beach on June 23.
Friends tried to save his life by applying cpr on the beach. He was first taken to Patong Hospital and then transferred to Vachira Phuket.
His death takes the drowning toll late last month on Phuket beaches from four to five within the space of four days.
The onset of the monsoon season is notoriously deadly but Phuket authorities failed to adopt any special precautions even after eight tourists drowned in the space of eight weeks between mid-May and mid-July last year.
Lifeguards and water safety experts have been urging authorities to adopt a triple-warning system so that newly arrived tourists, expecting a beach holiday, are told of possible dangers at Phuket International Airport, on arriving at their resort or guesthouse, and again at the beaches.
As a result of the spate of deaths, lifeguards took it upon themselves to string cords laden with red flags across particularly dangerous or unguarded sections of 13 popular Phuket beaches.
Phuket has two kinds of dangerous rips, the currents that can pull swimmers out to sea. One kind is a permanent rip that is always in the same spot, the other kind is a travelling rip, found in different spots depending on the daily conditions.
Phuket's seas at this time of the year are usually in any case unsafe for all but the strongest swimmers. Some resorts already warn guests to stick with the swimming pools in bad weather. Others take little responsibility.
The contract for the Phuket Lifeguard Service, extended temporarily for one month for budget negotiations with the Phuket Provincial Administrative Organisation, has been signed for the 10 months remaining in the budget year.
Gym Kho Kay's wife visited him often at Vachira Phuket before his death. Two of the five drownings were Russians.
July 2 Russian Gym Khao Khay, 32, dies in Vachira Phuket Hospital, effectively the fifth drowning victim on Phuket in the space of four days in June.
June 25 Phuket's lifeguards string red flags across dangerous stretches of 13 Phuket beaches, effectively closing the most dangerous parts of the beaches.
June 24 Phuket authorities react by holding a crisis meeting at Phuket Provincial Hall in Phuket City.
June 23 Phuket man Peerapon Nunark, 19, becomes drowning number four in four days when he disappears beneath the surf at Layan beach. Russian Gym Khao Khay is pulled from the surf at Karon in a coma.
June 22 Indian tourist Ramesh Chand Singhal, 49, goes into the surf at Kata with a bodyboard and drowns.
June 20 Two drownings within one hour as Belgian Laurent Jacques Leopold Wanter, 42, drowns at Laem Singh beach and Aleksande Poleshchenko, 29, drowns soon after at Patong beach.
June 19 Chinese tourist Chen Peng, 36, dies afterv being struck by a speedboat propeller in the water at scenic Pileh Bay, near Phi Phi.
June 18 Chinese tourist Ran Li, 23, drowns on a day-trip outing to Racha island.
June 14 Eighteen European envoys meet on Phuket and request more effort to improve marine and beach safety.
May 29 Chinese Ambassador Guan Mu makes a strong public plea on Phuket for more warnings - at the airport, at resorts and at beaches - to save more lives.
May 28 A Young Chinese tourist drowns on a day-trip from Phuket to Pai island.
May 21 British tourist Jeremy Thomas O'Neill, 37, is found dead on Patong beach about 6am. It is believed he may have misjudged the strength of the waves in darkness.