Tropical storm Glenda (international codename: Rammasun) entered the Philippine Area of Responsibility (PAR) on Sunday night but will not directly affect the country in the next 24 hours, the weather bureau said.
It is the seventh tropical cyclone to enter the country this year.
Weather forecaster Glaiza Escullar said two to three storms may enter the Philippines this month.
Escullar said that as of 4 p.m. of Saturday, the tropical storm was estimated at 1,150 kms east of Bicol Region, with maximum sustained winds of 65 kph and gustiness of up to 80 kph.
Escullar said the tropical storm is forecast to move west at 23 kph.
The storm will enhance the southwest monsoon and bring rains over Bicol and northern parts of Samar by Tuesday morning.
Metro Manila may experience rains from the southwest monsoon enhanced by the tropical storm by Tuesday or Wednesday.
If the storm maintains its movement, it is expected to make landfall in Quezon-Aurora province on Wednesday.