The Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) warned of heavy rainfall in several parts of Luzon as the southwest monsoon or Habagat continues to affect the country.

In Weather Advisory No. 27 issued at 11 a.m. Saturday, 29 August 2026, PAGASA forecast rainfall of 100 to 200 millimeters from Saturday to noon Sunday, 30 August, in Ilocos Sur, Pangasinan, La Union, Benguet, Bataan, Zambales, Tarlac and Pampanga.

Meanwhile, rainfall of 50 to 100 millimeters was forecast in Ilocos Norte, Abra, Apayao, Kalinga, Ifugao, Mountain Province, Nueva Vizcaya, Nueva Ecija, Bulacan, Metro Manila, Rizal, Cavite, Laguna, Batangas, Occidental Mindoro and Oriental Mindoro.

From noon Sunday to noon Monday, 31 August, PAGASA expects 100 to 200 millimeters of rain in Ilocos Norte, Ilocos Sur, La Union, Pangasinan, Abra, Benguet, Zambales and Bataan.

Rainfall of 50 to 100 millimeters is forecast in Apayao, Kalinga, Ifugao, Mountain Province, Nueva Vizcaya, Tarlac, Nueva Ecija, Pampanga, Bulacan, Metro Manila, Rizal, Cavite, Batangas and Occidental Mindoro during the same period.

From noon Monday to noon Tuesday, 1 September, rainfall of 100 to 200 millimeters is expected in Ilocos Norte, Ilocos Sur, La Union, Pangasinan, Abra, Benguet and Zambales.

Batanes, Apayao, Kalinga, Ifugao, Mountain Province, Nueva Vizcaya, Tarlac, Nueva Ecija, Bataan, Pampanga, Bulacan, Metro Manila and Cavite may receive 50 to 100 millimeters of rain.

PAGASA said rainfall could be higher in mountainous and elevated areas. The impacts in some areas may also be worsened by significant rainfall received in previous days.

The agency advised concerned public disaster risk reduction and management offices to take necessary measures to protect lives and property.

PAGASA's Regional Services Divisions may issue Heavy Rainfall Warnings, Thunderstorm Advisories and other severe weather information specific to their respective areas.

The next weather advisory is scheduled for 5 p.m. Saturday unless significant changes occur.

PAGASA also clarified that a Heavy Rainfall Warning differs from a Weather Advisory in terms of forecast period, coverage and accuracy.

A Heavy Rainfall Warning provides a forecast for the next three hours and can cover areas down to the municipal level. It uses Doppler radar technology to track real-time rainfall intensity and is intended to support immediate decision-making, particularly in flood-prone areas.

A Weather Advisory, meanwhile, covers a 24-hour period and is issued at the provincial level, providing a broader outlook on potential weather disturbances.

For class suspensions and other official decisions, PAGASA advised the public to refer to Heavy Rainfall Warnings issued by the respective Regional Services Divisions.