Tuesday, August 4, 2026 — Millions of Filipinos across Luzon and portions of the Visayas are waking up to a wet and potentially dangerous day as two Low-Pressure Areas (LPAs) and the Southwest Monsoon combine to bring heavy, flooding rainfall to large sections of the country. The Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) issued its forecast at 4:00 AM today, valid until 4:00 AM on Wednesday, August 5, 2026, urging residents in high-risk areas to be alert for flash floods and landslides.
What Is Driving Today's Weather
Three weather systems are working together to soak the Philippines today, according to PAGASA.
The first is a Low-Pressure Area (LPA) estimated near Baggao, Cagayan (17.9°N, 121.9°E). The second LPA sits over the coastal waters of Balaoan, La Union (16.8°N, 120.1°E). An LPA is a region of the atmosphere where air pressure is lower than in the surrounding area, causing warm, moist air to rise and form thick clouds and heavy rainfall. When two LPAs develop in close proximity, their combined effect can significantly enhance rainfall over a wide area.
Adding to the threat is the Southwest Monsoon, known locally as the habagat. The habagat is the seasonal wind pattern that blows moisture-laden air from the southwest across the Philippine landmass from roughly June through September. This year, it is currently affecting Southern Luzon and the western section of the Visayas, feeding additional moisture into the rain bands already being generated by the two LPAs.
Separately, Typhoon Dolphin (international designation: 2613) is located approximately 2,330 kilometers east-northeast of Extreme Northern Luzon as of 3:00 AM today. With maximum sustained winds of 150 km/h near the center and gustiness of up to 185 km/h, Dolphin is moving westward at 25 km/h — but it remains outside the Philippine Area of Responsibility (PAR) and is not directly affecting the country at this time. PAGASA is monitoring its track and movement. Readers should watch for further updates.
Region-by-Region Forecast
Northern and Central Luzon
Residents in the Ilocos Region, Cordillera Administrative Region (CAR), Cagayan Valley, and Central Luzon should expect cloudy skies with scattered rainshowers and thunderstorms throughout the day. PAGASA attributes these conditions to the LPA estimated near Baggao, Cagayan. People in these areas should be prepared for sudden downpours that can cause localized flooding in low-lying communities and landslides in mountainous and hilly terrain.
Metro Manila, CALABARZON, MIMAROPA, Bicol, and Occidental Mindoro
The most significant weather impacts today are expected across Metro Manila, CALABARZON, MIMAROPA, Bicol Region, and Occidental Mindoro. PAGASA forecasts cloudy skies with rain, thunderstorms, and strong wind gusts in these areas, driven by the Southwest Monsoon. Critically, PAGASA warns of a high risk of flash floods and landslides in affected communities. Residents near riverbanks, low-lying coastal areas, and hillside communities should remain on high alert and be ready to respond to evacuation orders from local authorities.
The Rest of the Country
Other parts of the Philippines — including most of the Eastern Visayas, much of Mindanao, and other areas not specifically cited above — can expect partly cloudy to cloudy skies with isolated rainshowers or thunderstorms during the forecast period. While conditions are less severe, brief but heavy bursts of rain and lightning are still possible and residents should remain weather-aware.
Wind and Coastal Water Conditions
PAGASA also warns that wind and sea conditions will be hazardous in parts of the country today.
Over northern and central Luzon, winds will be moderate to strong, with coastal waters ranging from moderate to rough, and wave heights expected to be hazardous to rough. Small fishing boats and bancas operating in these waters face a real danger of capsizing or being overwhelmed by large swells.
Over the rest of the country, winds will be light to moderate, with coastal waters described as slight to moderate. While less dangerous, these conditions still warrant caution for smaller watercraft.
Understanding Today's Warnings: What Each Level Means and What to Do
PAGASA's forecast explicitly flags the risk of flash floods and landslides for Metro Manila, CALABARZON, MIMAROPA, Bicol Region, and Occidental Mindoro. This is not a minor advisory — flash floods can develop within minutes of intense rainfall and can be life-threatening, particularly in low-lying urban areas, near rivers, and in mountainous communities prone to soil movement.
If you live in or are traveling through any of these flagged areas today, PAGASA's warning means you should monitor water levels in nearby rivers and drainage systems, avoid crossing flooded roads or waterways, and know your community's evacuation routes in advance. Local government units may issue preemptive evacuation orders — follow them immediately.
For a complete guide to understanding official weather warnings — from rainfall color codes to tropical cyclone wind signals — see our explainer on how to read PAGASA's weather warnings.
What This Means for You Today
Commuters
Commuters in Metro Manila, CALABARZON, and the Bicol Region should brace for traffic disruptions caused by flooding on major roads. Leave earlier than usual, avoid underpasses and low-lying roads that are known to flood quickly during heavy rain, and keep an eye on real-time flood alerts from your local DRRMO or the PAGASA website before heading out.
Fisherfolk and Small-Boat Operators
Fishing and small-vessel operations off the northern and central coasts of Luzon are strongly discouraged today. PAGASA is reporting moderate to rough seas with hazardous wave heights in these waters. Do not set out to sea if you are operating a small or medium-sized watercraft in these zones. Even in the rest of the country where seas are described as slight to moderate, conditions can change quickly — stay close to shore and monitor updates frequently.
Farmers
Farmers in Cagayan Valley, Ilocos, CAR, and Central Luzon should secure loose equipment, check drainage in low-lying fields, and hold off on any activities that require dry ground or clear skies. In Southern Luzon — particularly Bicol and MIMAROPA — the combination of habagat moisture and the active LPA makes crop damage from waterlogging and wind a significant concern today.
Students, Parents, and Schools
Parents and school administrators in Metro Manila, CALABARZON, MIMAROPA, and Bicol should closely monitor class suspension announcements from local government officials, particularly if rainfall intensifies during the morning and midday hours. PAGASA's warning of flash floods and landslides in these areas means conditions can deteriorate quickly. Children should not be sent out during heavy downpours, and parents should have a clear plan in case schools are dismissed early.
Outdoor Workers and Construction Sites
Workers on outdoor and construction sites across Luzon should halt elevated or scaffolding work if strong gusts develop, especially in Metro Manila, CALABARZON, and Central Luzon. Thunderstorms bring lightning risk in addition to rain and wind. Supervisors should implement weather-delay protocols if conditions deteriorate during the day.
Temperature and Humidity
PAGASA's weather station at the Science Garden in Diliman, Quezon City recorded the following extremes for the 24-hour period ending at 8:00 PM on Monday, August 3, 2026:
- Maximum temperature: 29.5°C (recorded at 5:00 PM)
- Minimum temperature: 24.9°C (recorded at 5:00 AM)
- Maximum relative humidity: 96% (recorded at 8:00 AM)
- Minimum relative humidity: 74% (recorded at 2:00 PM)
The high humidity — peaking at 96% — combined with overcast skies and persistent rain means that while temperatures are not extreme today, the air will feel heavy and muggy, and wet conditions will persist for most of the day in affected areas.
Tides and Astronomical Information
For reference, tidal information for Manila today, Tuesday, August 4, 2026, as provided by NAMRIA (courtesy of PAGASA), is as follows:
- High tide: 12:12 AM — 0.75m
- Low tide: 6:56 AM — 0.51m
- High tide: 1:31 PM — 0.99m
- Low tide: 8:48 PM — 0.4m
Sunrise is at 5:46 AM; sunset at 6:20 PM. Moonrise is at 10:09 PM; moonset at 10:00 AM. Moon illumination is at 67%.
Bottom line: If you are in Metro Manila, CALABARZON, MIMAROPA, Bicol Region, or Occidental Mindoro today, PAGASA's warning of flash floods and landslides is the most important thing to act on. Know your evacuation route, avoid flooded areas, and do not wait until water levels rise before moving to safety. Fisherfolk off the northern and central Luzon coasts should stay ashore — seas are rough and hazardous today.
Monitor official PAGASA updates at pagasa.dost.gov.ph.