Fifteen signs will be erected on Kata and Karon beaches giving warnings in Thai, Chinese, English, Russian, French, Korean and German.
The sign includes a message, though in English only, from Karon Mayor Thawee Thongcham, which says, “The monsoon season has started and on certain days the sea can be very dangerous.
“Whenever the red flag is placed, we urge you not to swim in the sea as there are invisible undercurrents which are almost impossible to detect from the shore.
“Too many accidents occur every year on the Andaman Sea beaches and we cannot assume any responsibility in the case of accidents.”
The chief of the Karon Municipality Tourist Rescue Center, Suphachai Janpetch, said he is still worried about tourists who have no experience of rip currents in the water off Phuket.
In the past month, three people drowned, Mr Suphachai said, yet some tourists still ignore red flags and even verbal warnings from beach guards.