Remnants of Typhoon Koinu bring floods to Hong Kong

The bureau also issued a landslide warning with many areas of the mountainous city at risk after unusually wet weather.

Hundreds of passengers were stranded at Hong Kong's airport overnight and underground metro stations as Koinu disrupted flights and transport, public broadcaster RTHK reported.

The Airport Express train which connects the airport to the central business district stopped running while services at some metro stations were partially suspended. Services had since resumed at limited frequencies, operator MTR said.

The strong winds were expected to ease later in the day, the Observatory said, and the stock exchange is scheduled to reopen for the afternoon session.

Torrential rain early in September led to widespread flooding across the city, submerging streets, shopping malls and metro stations after typhoon Haikui made landfall in China's coastal Fujian province.