Officials say a landslide Monday in the mountains of Taichung county killed two people in a makeshift shelter. They had previously reported two other deaths in landslide in Nantou county.
The government said Tuesday that 3,000 people have been evacuated from flood-hit areas across the island.
Large swathes of the capital of Taipei were submerged Tuesday in knee-high flood waters after a night of downpours.
The Central Weather Bureau says the torrential rains may last until Wednesday.