Two siblings perished in an overflowing river in the western island of Palawan while a seven-year-old boy drowned in a river east of Manila.
The center of Mawar remained well offshore of the country as it began to intensify into a storm that eventually reached Category 3 force.
Philippine officials told reporters the fatalities on Sunday were due to heavy downpours and high winds generated by the storm’s outer bands.
The typhoon later skirted Okinawa, where U.S. military personnel said it generated wind gusts of up to 47 mph at Kadena Air Base early Tuesday morning.
Mawar later lost force over the cooler waters of the Pacific well to the east of Japan’s main island of Honshu.
Typhoon Mawar Track
Satellite Loop Data: CIMSS