On August 28, 2026, parts of Luzon were affected by persistent heavy rains caused by the southwest monsoon (habagat), which was further enhanced by a low-pressure area located northeast of the Philippines.

The low-pressure area further enhanced the active habagat, expanding the affected areas in Luzon.

Rainfall intensified and expanded from 27 to 29 August. Heavy rainfall warnings were progressively raised as conditions worsened.

3-day rainfall totals between Aug 28-30, 2026, heaviest rainfall observed in western parts of Luzon, Metro Manila, and Rizal.
Major dams were also affected, with Ipo Dam exceeding its spilling level and La Mesa Dam exceeding its overflow elevation.

PAGASA Science Garden Station recorded a 3-day total rainfall of 305.4 mm, equivalent to more than 300 liters of water (per square meter). Approximately 1000 blue drums of water spilling over a standard basketball court.
For comparison, Science Garden Station recorded 347.5 mm in just six hours during Typhoon Ondoy (2009), the highest 6-hour rainfall on record.

The prolonged rainfall triggered widespread flooding and landslides that caused damage to infrastructure and properties, as well as disruptions to transportation.

The western Philippines has experienced above-normal rainfall during the habagat season due to the ongoing El Niño. However, the ongoing El Niño is expected to strengthen from October 2026 to February 2027, increasing the likelihood of below-normal rainfall and drought in many parts of the country, along with warmer-than-usual temperatures.

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