The sub-index of the Hang Seng tracking energy shares dropped 6.8%, the IT sector fell 3.6%, the financial sector lost almost 4% and the property sector was down 4.2%.
Hong Kong stocks took much of the heat on Monday with Mainland China's markets closed for a public holiday until Wednesday. The offshore yuan weakened to a six-week low in early trade, extending Friday's fall.
About 2.56 billion Hang Seng index shares were traded. The volume traded in the previous trading session was 1.65 billion.