Red flags were strung on cords on areas of the beaches known to be places where permanent and travelling ''rips'' are found.
Four people drowned on Phuket beaches in four days and a rescued Russian man remains in a coma at Phuket Vachira Hospital in Phuket City.
The beaches where deaths occurred were Patong, Laem Singh, Layan and Kata. Lifeguards acted at those beaches today and at Karon, Kamala, Surin and other popular spots.
The Phuket Lifeguard Service has opted to close parts of the beaches considered dangerous every day.
''We will do what we can,'' a spokesperson said today. ''But we still need help because even with the red flags on cords, some people will try to swim.''
The lifeguards have stations on Phuket's west coast beaches but there are not enough of them to guard the longer beaches.
Senior officials met at Phuket Provincial Hall in Phuket City yesterday to address the issue of the drownings.
Between Thursday and Sunday, a Belgian, a Russian, an Indian and a 19-year-old Thai drowned at four different Phuket west coast beaches.
The onset of the monsoon season alwayd brings added danger - eight swimmers died in eight weeks between mid-May and mid-July last year.
Little appears to have been done to meet the suggestion of water safety experts to warn arriving tourists at this time of the year at Phuket International Airport, in person when they check in at resorts and guesthouses, and when they attempt to swim on days when red flags are flying.
Beach safety is likely to be high on the agenda when ambassadors and their representatives meet the Minister for Tourism and Sport in Bangkok to talk about Phuket on Friday.