Schools, government offices and banks are suspended and winds with gusts potentially exceeding 180 kilometres per hour are affecting the territory.
SMG
At nearly 7 pm, Nalgae was located about 140 kilometres southeast of Macao, moving towards west of Pearl River Estuary.
Cloud cover will increase in the following two days with a few showery patches as temperature is predicted to gradually fall to 17 degrees Celsius on Wednesday.
All signals will be cancelled this evening as winds in Macao weaken further; city will suffer heavy rain until tomorrow.
Public buses and banks will resume operations at 11 am and 2 pm, respectively, while all government departments will resume operations in the afternoon.
Due to strong winds and gusts, all drivers are advised to pay attention to road safety, motorcyclists urged to use designated motorcycle lanes on Sai Van Bridge.
Local weather expected to become unstable starting this afternoon; possibility of hoisting Signal No 8 between tonight and tomorrow morning is high, while the issuing of Signal No 9 is low.
Typhoon Ma-on will enter within 800 kilometres of Macao this evening with a chance of storm surge in the city.
Typhoon Ma-on predicted to enter the northern part of South China Sea midweek but its path and intensity are still uncertain.