MANILA, August 19, 2026 — The southwest monsoon is tightening its grip on Luzon this Wednesday, bringing heavy rainfall, flooding threats, and dangerous coastal conditions to millions of Filipinos across the country's largest island group. PAGASA's 4:00 AM forecast bulletin warns that residents in several provinces face a real risk of floods and landslides through the day, while two tropical depressions remain outside Philippine territory but are being closely tracked.
What Is Driving Today's Weather?
The primary force behind today's conditions is the southwest monsoon, known locally as habagat. This is the seasonal wind system that blows moist air from the direction of the South China Sea toward the Philippines, typically from June through September. When it strengthens — often in response to tropical cyclones or low-pressure systems positioned near or around the Philippines — it can dump enormous volumes of rain on Luzon's western-facing coastlines and funnel heavy rainfall deeper inland. Today, the habagat is the dominant weather driver affecting Luzon and the western section of Visayas, according to PAGASA.
Adding to the picture, Tropical Depression "Neneng" was located approximately 675 km east of Itbayat, Batanes, as of 3:00 AM today, with maximum sustained winds of 55 km/h near the center and gusts of up to 70 km/h. It is moving westward at 15 km/h. Critically, Neneng is currently outside the Philippine Area of Responsibility (PAR) and is not directly producing rain over the country at this time. A second tropical depression, located about 3,000 km east of northeastern Mindanao, is also outside PAR and moving westward slowly. PAGASA will continue to monitor both systems.
Region-by-Region Forecast
Luzon: Flooding Threat in Several Provinces
The hardest-hit areas in Luzon today are expected to be Zambales, Bataan, and Occidental Mindoro, where PAGASA forecasts heavy rainfall driven directly by the southwest monsoon. Residents in these provinces face possible flash floods and landslides, particularly in low-lying and mountainous communities. People living near rivers, creeks, and slopes in these areas should be on heightened alert.
A broad swath of provinces in and around Metro Manila will see occasional to moderate rainfall. PAGASA specifically lists Metro Manila, Ilocos Sur, Ilocos Norte, La Union, Pangasinan, Abra, Benguet, Tarlac, Pampanga, Bulacan, Nueva Ecija, Laguna, Cavite, Batangas, and Oriental Mindoro under a forecast of occasional rain with possible localized flooding due to moderate monsoon influence. Commuters and urban residents across the National Capital Region and Central Luzon should anticipate wet morning and afternoon conditions and the possibility of flooded streets.
The rest of Luzon — areas not specifically listed above — can expect partly cloudy to cloudy skies with scattered rain showers and thunderstorms, also driven by the southwest monsoon. Flash floods or landslides remain possible in susceptible areas even in these locations.
Visayas: Mixed Conditions, West More Affected
Within the Visayas, Antique and Aklan are singled out by PAGASA for cloudy skies with scattered rain showers and thunderstorms due to the southwest monsoon, with the risk of flash floods or landslides. These two western Visayas provinces are directly exposed to the habagat and should be treated similarly to the more-affected parts of Luzon today.
Mindanao and the rest of Visayas — meaning provinces not specifically mentioned above — are forecast to have partly cloudy to cloudy skies with isolated rain showers or thunderstorms, this time caused by localized weather systems rather than the monsoon directly. Flash floods or landslides remain a possibility in these areas as well, particularly during any intense thunderstorm activity.
Mindanao: Isolated Showers Possible
Mindanao as a whole is expected to experience partly cloudy to cloudy skies with isolated rain showers or thunderstorms, attributed to localized weather systems. While conditions are generally less severe than in Luzon and western Visayas today, residents in low-lying and mountainous areas across Mindanao should remain cautious whenever thunderstorms develop, as even isolated heavy downpours can trigger flash flooding in vulnerable areas.
Decoding the Warnings: What the Forecast Levels Mean for You
PAGASA's forecast uses specific language to communicate risk levels — and understanding them can make a meaningful difference to your safety today. The terms "possible flash floods or landslides" and "possible flooding" are not bureaucratic formalities; they are PAGASA's way of telling you that ground conditions are primed for rapid water accumulation if rain becomes intense. For a full guide on how PAGASA's warning system works — from rainfall color codes to storm signals — read our explainer on how to read PAGASA's weather warnings.
Today's highest concern is concentrated in Zambales, Bataan, and Occidental Mindoro, where the language in the bulletin — "possible flash floods or landslides" tied directly to the southwest monsoon — indicates that these provinces are receiving the full force of the habagat and should be treated as the day's primary risk zones. In the Metro Manila cluster of provinces, PAGASA's language of "possible localized flooding" reflects moderate but real risk, particularly for drainage-challenged urban areas.
No tropical cyclone wind signals are in effect for any part of the Philippines at this time, as both tropical depressions are outside PAR.
Coastal and Wind Conditions: Danger at Sea
PAGASA's wind and coastal water forecast paints a serious picture for mariners today, particularly in the north and west:
- Northern and western sections of Luzon: Strong to gale-force winds (confirmed in the source as "Strong to Gale"), with rough to very rough seas and wave heights of approximately 4.5 to 5 meters. These are dangerous conditions for any small watercraft.
- The northern and eastern sections of Luzon: Moderate to strong winds, with rough to moderately rough seas.
- The eastern section of the country: Moderate to fresh winds, with slight to moderate seas (wave heights of approximately 0.6 to 2.1 meters).
- The rest of the country: Light to moderate southwest winds, with slight to moderate seas (wave heights of approximately 0.6 to 2.1 meters).
Fisherfolk and all small-boat operators along the northern and western coasts of Luzon are strongly advised not to venture out to sea today. Conditions described as rough to very rough with gale-force winds represent a serious threat to life and vessel safety. Even in areas with moderate sea conditions, mariners should exercise heightened caution and continuously monitor PAGASA updates before and during any maritime activity.
What It Means for You
Commuters — Metro Manila and Central Luzon
Expect wet roads, reduced visibility during rain bursts, and possible flooding in low-lying streets and underpasses across Metro Manila, Pampanga, Bulacan, and Laguna today. Give yourself extra travel time, particularly during the afternoon when accumulated rainfall can worsen urban flooding. If you see floodwater rising rapidly, do not attempt to cross — turn around and seek higher ground.
Fisherfolk and Small-Boat Operators
PAGASA's coastal water forecast is unambiguous: the northern and western seaboards of Luzon face rough to very rough conditions with gale-force winds today. If you fish or operate boats in these waters — including off the coasts of Ilocos Norte, Ilocos Sur, Pangasinan, Zambales, Bataan, or the waters surrounding Batanes — stay ashore. These are not conditions to test. Even in gentler waters around the rest of the country, use caution and monitor updates continuously.
Farmers
Farmers in Zambales, Bataan, and Occidental Mindoro should secure crops, equipment, and livestock ahead of potential flooding. Those in the Metro Manila cluster of provinces and other Central Luzon areas receiving occasional rain should also monitor water levels in irrigation systems and low-lying fields. Standing water after heavy rain can damage unharvested crops and create conditions for plant disease.
Students, Parents, and School Administrators
Schools in Zambales, Bataan, Occidental Mindoro, and the western Visayas provinces of Antique and Aklan should be especially attentive to conditions this morning, as these are the areas PAGASA has flagged most explicitly for rain-driven flooding and landslide risk. Parents in Metro Manila and surrounding provinces should also prepare for the possibility of wet, disruptive weather during school dismissal hours in the afternoon.
Outdoor Workers and Construction Sites
Those working in construction, agriculture, or other outdoor occupations across Luzon should treat today's forecast with caution. Heavy rain and gusty winds can make outdoor work hazardous, and conditions in the most affected provinces warrant suspension of outdoor activities at the first sign of intense rainfall. All outdoor workers should identify nearby safe structures before beginning any work today.
Temperature and Humidity Outlook
PAGASA's latest observed temperature data — recorded at their weather station for the 24-hour period ending at 8:00 PM yesterday — showed a maximum temperature of 28.3°C (recorded at 1:00 PM) and a minimum temperature of 24.8°C (recorded at 5:00 AM). Relative humidity reached a maximum of 100% and a minimum of 76%, reflecting the heavily moisture-laden atmosphere now dominating the region. On a day like today, when cloud cover and continuous rain suppress solar heating, temperatures across affected areas are likely to remain in a similar moderate but humid range, with the muggy feel of the southwest monsoon season in full effect.
The Two Tropical Depressions: What You Should Know
PAGASA is tracking two tropical depressions, but neither is currently inside the Philippine Area of Responsibility. Tropical Depression Neneng, located 675 km east of Itbayat, Batanes, with winds of 55 km/h and gusts to 70 km/h, is moving westward at 15 km/h — a direction that bears continued watching. A second, unnamed tropical depression is located about 3,000 km east of northeastern Mindanao, moving westward slowly. At present, neither system requires immediate public action, but Filipinos — especially those in northern Luzon — should continue monitoring PAGASA updates for any changes in Neneng's track and intensity as it edges in the direction of the country.
Bottom line: If you live in Zambales, Bataan, Occidental Mindoro, Antique, or Aklan — or in Metro Manila and surrounding provinces — stay vigilant for sudden flooding and landslides today. Fisherfolk along the northern and western coasts of Luzon should remain ashore in the face of rough to very rough seas. Monitor official PAGASA updates at pagasa.dost.gov.ph for the latest developments, especially on the movement of Tropical Depression Neneng.
Monitor official PAGASA updates at pagasa.dost.gov.ph.