Several federal and state roads have been closed to light vehicles and may be entirely cut off if the situation worsens, officials said.
Parts of neighbouring Melaka state were also hit by flooding with dozens of families evacuated from their homes.
"We have enough manpower, equipment and emergency funding for this purpose," Othman told the daily New Straits Times newspaper.
"There will also be enough food supplies for flood victims."
Reports said teams of police, firefighters and volunteers had been dispatched to search for victims who may be trapped in their homes.
Central Selangor state which surrounds the main city of Kuala Lumpur could also be affected if the poor weather persists, according to the meteorological department.
The Malaysian Meteorological Department has forecast moderate to heavy rain will to continue until Friday.
Peninusla Malaysia’s monsoon season is between November and March.