Hong Kong's Leisure and Cultural Services Department reported on August 18, 2026, that red flags had been raised at several beaches because of big waves. The flags were hoisted at Stanley Main Beach, Shek O Beach and Big Wave Bay Beach in Southern District on Hong Kong Island; at Pui O Beach in Islands District; and at Silverstrand Beach and Clear Water Bay Second Beach in Sai Kung District.

According to the department's announcement, beachgoers were advised not to swim at these beaches while the red flags were in place. The notice was issued as a broadcast item for swimmers. The announcement did not say how long the flags would remain up or what conditions would allow them to be lowered.