The national disaster agency reported that eight people have died as a result of the rain and floods in Luzon, mostly by drowning. Four more people are missing and 41 have been injured, it said.
About 281,000 people have had to leave their homes and seek shelter with friends and relatives or in evacuation centers, the council said. Images showed displaced people using the pews in a church in Quezon City, part of Metro Manila, as makeshift beds.
The pouring rain and rising water are grimly familiar to Manila residents as August is generally the area's wettest month.
Severe flooding in the region a year ago, also caused by monsoon rains, killed scores of people.