MANILA, August 28, 2026 — A large portion of the Philippines is waking up to heavy monsoon rains and rough coastal waters this Thursday, as the southwest monsoon — locally called habagat — continues to pummel Luzon and Visayas, while a Low Pressure Area (LPA) lurking to the northeast adds another layer of concern. PAGASA issued its 24-hour public weather forecast at 4:00 AM today, valid until 4:00 AM on August 29, 2026.
Residents from Batanes in the north to the Visayas in the central Philippines are advised to stay alert, as flash floods and landslides are among the hazards flagged by PAGASA for several provinces today.
What Is Driving Today's Weather?
Two weather systems are shaping the nationwide forecast today.
The dominant force is the southwest monsoon, or habagat — a seasonal wind pattern that blows moist air from the southwest across the country between roughly June and October. When this moisture-laden wind hits land, it rises, cools, and releases heavy rainfall, particularly over the western coasts and higher terrain of Luzon and Visayas. This explains why provinces on or near the western side of the country are most exposed to serious rain today.
The second factor is a Low Pressure Area (LPA), which PAGASA located at 3:00 AM today approximately 720 kilometers east of Itbayat, Batanes, at coordinates 21.9°N, 128.7°E. An LPA is a zone where atmospheric pressure is lower than its surroundings, causing air to spiral inward and upward — drawing in clouds and moisture. While the LPA is currently far from the main Philippine landmass, PAGASA is tracking it, and Filipinos should watch for updates throughout the day on whether it develops further or shifts closer.
Region-by-Region Forecast
Luzon: Heaviest Rains in the West and Highlands
Luzon bears the brunt of today's habagat rains. PAGASA has broken the island group's exposure into three distinct tiers based on severity.
The hardest-hit areas are Batangas, Cavite, Zambales, and Bataan, which are expected to receive heavy to intense monsoon rains. PAGASA explicitly flags the risk of flash floods and landslides in these provinces — a serious hazard that residents should not take lightly, especially those living near rivers, low-lying areas, coastal zones, and hillsides.
A broader band of provinces faces significant but slightly less extreme rainfall: the Ilocos Region, Abra, Benguet, Tarlac, Pampanga, Nueva Ecija, Bulacan, Rizal, Quezon, Occidental Mindoro, Oriental Mindoro, Marinduque, and Romblon. PAGASA warns of possible flash floods and landslides in these areas as well, driven by the southwest monsoon with moderate to heavy rain expected.
The rest of Luzon — areas not explicitly named above — can expect cloudy skies with light to moderate rain and occasional thunderstorms, also attributed to the southwest monsoon.
Visayas: Widespread Cloud Cover and Thunderstorms
The entire Visayas region is under the influence of the southwest monsoon today. PAGASA forecasts cloudy skies with scattered rain showers and thunderstorms across the region. While the language is slightly less severe than the flash flood warnings issued for parts of Luzon, residents across the Visayas — including those in Western Visayas, Central Visayas, and Eastern Visayas — should expect disruptions from rain and periods of heavy downpours, particularly during thunderstorm episodes.
Flash floods and landslides remain possible hazards in the Visayas given the scattered but potentially intense nature of the thunderstorms.
Mindanao: Isolated Showers and Thunderstorms
Mindanao gets a relatively lighter forecast compared to the north and central Philippines. PAGASA expects isolated rain showers or thunderstorms across Mindanao, produced by localized weather systems. While the coverage is less widespread than in Luzon or Visayas, residents should still be cautious during any sudden downpours, which can cause localized flooding and landslides — especially in mountainous areas. PAGASA notes that flash floods and landslides are possible during severe thunderstorm episodes.
Wind and Coastal Water Conditions
Coastal conditions are a serious concern for maritime activity across the country today. PAGASA forecasts the following sea states:
Over Luzon, winds are moderate to strong coming from the southwest. Coastal waters around Luzon are described as moderate to rough. Over the rest of the country, winds are also coming from the south to southwest, with coastal waters similarly classified as slight to moderate.
Rough seas pose a direct danger to small fishing boats and other light watercraft. PAGASA's guidance in these conditions is clear: small vessel operators face significant risk, and anyone planning to head out to open water should reconsider until sea conditions improve.
Decoding the Warnings: What These Conditions Actually Mean
PAGASA's forecast today does not carry a tropical cyclone wind signal, but the hazard language — flash floods and landslides — deserves attention. These are direct consequences PAGASA has associated with the heavy monsoon rainfall expected today, not merely hypothetical risks.
Flash floods can develop with little warning in low-lying areas, riverbeds, and drainage channels during intense rainfall. If you live near a river or in a flood-prone area in any of the named provinces, be ready to move to higher ground quickly if water begins to rise rapidly.
Landslides are a risk in hilly and mountainous terrain during sustained heavy rain. If you live on or near a slope in Benguet, Abra, Batangas, or the other highlighted provinces, monitor your surroundings and heed any evacuation orders from local government units.
For a full explanation of how PAGASA classifies rainfall warnings, storm signals, and coastal hazard levels, see our guide on how to read PAGASA's weather warnings.
What Today's Weather Means for You
Commuters
If you are commuting through Metro Manila, the CALABARZON provinces (Cavite, Batangas, Rizal, Quezon), or the western Luzon provinces today, expect significant travel disruptions. Heavy rain can cause flash flooding on roads, road closures near waterways, and reduced visibility during thunderstorms. Allow extra travel time, avoid flooded roads regardless of depth, and monitor your local government's social media for road condition advisories.
Fisherfolk and Small Boat Operators
Moderate to rough seas along Luzon's coastlines and slight to moderate conditions elsewhere make today a high-risk day for small vessel operations. PAGASA's forecast strongly implies that small boats should remain in port. If you are already at sea, return to port as soon as it is safe to do so. Do not wait for conditions to worsen before making the decision to head back.
Farmers
The sustained heavy rainfall across much of Luzon and Visayas carries both risk and nuance for the agricultural sector. Standing crops in low-lying fields in Batangas, Cavite, Pampanga, Bulacan, and the Ilocos Region face inundation risk if flash floods materialize. Secure harvested produce and check drainage in fields where possible. In the Cordillera highlands — including Benguet — the landslide risk warrants extra caution for farmers working terraced fields or accessing mountain farm roads.
Students, Parents, and School Administrators
Parents in the affected provinces — particularly in Batangas, Cavite, Zambales, Bataan, and the broader Luzon areas flagged for heavy rain — should check their local government and school division announcements early this morning regarding class suspensions. Heavy rain, flooded roads, and landslide risks are common triggers for suspension orders. Do not send children to school if your route involves crossing swollen rivers or flooded roads.
Outdoor Workers and Construction Teams
Workers in construction, utilities, and other outdoor industries across Luzon and Visayas face elevated risk today from both the rain itself and associated hazards like sudden strong gusts during thunderstorms. Site supervisors should assess whether it is safe to continue outdoor operations, particularly on elevated structures, scaffolding, or near waterways.
Temperature and Humidity Outlook
PAGASA recorded the following figures at its weather station in Science Garden, Diliman, Quezon City for the 24-hour period ending at 8:00 PM yesterday, August 27, 2026:
- Maximum temperature: 31°C (recorded at 2:00 PM)
- Minimum temperature: 28.4°C (recorded at 5:00 AM)
- Maximum relative humidity: 94% (recorded at 5:00 AM)
- Minimum relative humidity: 71% (recorded at 12:00 PM)
The near-maximum humidity levels — reaching 94% — reflect how saturated the atmosphere has become under sustained monsoon conditions. While temperatures themselves are not extreme, the combination of heat and high humidity can make conditions feel oppressive and physically draining, especially for those working outdoors for extended periods. Drink water regularly, stay in shaded or ventilated areas when possible, and recognize the signs of heat exhaustion even on rainy days.
Tidal and Astronomical Information
PAGASA also issued tidal predictions for today. High and low tide details are available in the official bulletin. The sun rose this morning and will set this evening per standard August schedules for the Philippines. Moonrise and moonset times are also noted, with illumination at 100% — indicating a full moon — which can contribute to higher-than-normal tidal fluctuations along coastlines. Residents in low-lying coastal communities should be aware that the combination of monsoon swells and a full moon's tidal effect could elevate coastal flooding risk.
Bottom Line
If you are in Batangas, Cavite, Zambales, Bataan, or any of the other Luzon and Visayas provinces flagged today, the single most important thing you can do is stay away from rivers, flooded roads, and hillsides prone to landslides. The southwest monsoon is delivering serious rainfall, flash floods are a real and immediate risk in multiple provinces, and coastal waters are rough enough to endanger small boats. Stay informed, stay cautious, and let local authorities guide any evacuation decisions.
Monitor official PAGASA updates at pagasa.dost.gov.ph.