Hong Kong's Leisure and Cultural Services Department announced on August 20, 2026, that red flags had been hoisted at four beaches because of big waves. The affected beaches were Stanley Main Beach, Shek O Beach and Big Wave Bay Beach in Southern District on Hong Kong Island, and Clear Water Bay Second Beach in Sai Kung District.

The department advised beachgoers not to swim at these beaches while the red flags were in place. The notice was aimed at swimmers and was issued for broadcast by television and radio announcers.

The advisory described conditions as of that announcement; it did not indicate when the flags might be lowered or how long the warning would remain in effect.