QUEZON CITY, September 8, 2026 — The southwest monsoon, known locally as "habagat," is sweeping across much of the Philippines this Tuesday, bringing heavy to intense rainfall, a significant risk of flash floods and landslides, and unsettled seas to coastal communities from Luzon down through the Visayas. The Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) issued this forecast effective 4:00 AM on September 8, 2026, valid through 4:00 AM on September 9.
Millions of Filipinos — from Metro Manila commuters to fishing communities in Palawan and farming households in the Visayas — should brace for a wet and hazardous Tuesday. The forecast covers the entire country, and while Mindanao is less directly affected by the monsoon, no part of the archipelago is entirely free from rain risk today.
What Is Driving Today's Weather?
PAGASA attributes today's conditions across Luzon and Visayas to the Southwest Monsoon. In plain terms, the southwest monsoon is a large-scale seasonal wind system that blows moisture-laden air from the South China Sea and the Indian Ocean toward the Philippines from roughly June through September. When this airstream hits the mountain ranges and landmasses of the western Philippines, it is forced upward, cools rapidly, and produces persistent, widespread rainfall — sometimes turning intense for extended periods. The habagat is one of the Philippines' two dominant seasonal weather drivers, and at its peak it can deliver days or even weeks of continuous rain to western-facing provinces.
Today, the habagat is robust enough to affect not just the western seaboard but Metro Manila, the broader Luzon region, and the Visayas, underscoring just how active the monsoon flow is at this point in September.
Region-by-Region Forecast
Palawan and Occidental Mindoro: Heaviest Rain Today
PAGASA singles out Palawan and Occidental Mindoro as facing the most severe conditions on Tuesday. These provinces can expect cloudy skies with moderate to heavy — and at times intense — rainfall and thunderstorms throughout the day. Residents should be on high alert: PAGASA explicitly warns of the possibility of flash floods and landslides in these areas. Communities near rivers, slopes, and low-lying coastal zones should monitor local government announcements closely and be ready to evacuate if conditions worsen.
Metro Manila, the Rest of Luzon, and Eastern Visayas
Metro Manila and the rest of Luzon — including provinces not specifically named — will experience cloudy skies with scattered rainshowers and thunderstorms driven by the southwest monsoon. Flash floods and landslides remain a real possibility. Metro Manila residents should expect slippery roads, reduced visibility during downpours, and potential flooding in low-lying streets and flood-prone barangays — conditions that routinely disrupt the morning and evening rush hours.
Eastern Visayas also falls under this forecast band, with cloudy skies, scattered rains, and thunderstorms expected. The same flash flood and landslide warnings apply.
The Rest of the Visayas: Rainshowers and Thunderstorms
Across the remaining areas of the Visayas — including central and western island groups not listed under the heavier rain zone — PAGASA forecasts cloudy skies with scattered rainshowers or thunderstorms. The southwest monsoon remains the driver. Flash floods and landslides are possible, meaning residents in hilly or riverine communities must remain vigilant even if conditions seem less severe than in Luzon's western provinces.
Mindanao: Isolated Showers, Thunderstorm Risk
Mindanao is not directly under the southwest monsoon's main influence today, but it is not in the clear. PAGASA forecasts partly cloudy to cloudy skies with isolated rainshowers or thunderstorms, attributed to local weather systems. Importantly, PAGASA warns of possible flash floods or — in a notable addition — severe thunderstorms for Mindanao. Residents should not treat the partly cloudy outlook as an all-clear: isolated but intense thunderstorms can develop quickly, especially in the afternoon hours.
Wind and Coastal Water Conditions
For Luzon and Visayas, PAGASA forecasts light to moderate winds blowing from the southwest to west, with coastal waters described as slight to moderate — meaning wave heights could make conditions challenging for small fishing boats and bancas. Fisherfolk are strongly advised to assess sea conditions carefully before heading out.
In Mindanao, winds will be light to moderate from the east and southeast, with slight to moderate seas as well. While conditions are somewhat calmer on the Mindanao side, small-craft operators should still exercise caution.
Decoding the Warnings: What Flash Flood and Landslide Risk Actually Means
PAGASA's forecast consistently flags the possibility of flash floods and landslides across all regions today. This is not a casual note — it is an advisory that the rainfall intensity and duration being forecast are sufficient to trigger rapid flooding of normally dry areas and destabilize slopes in mountainous or hilly terrain. Flash floods can occur with little warning; landslides can be triggered even hours after heavy rain begins.
If you live in a low-lying area, near a river, creek, or estero, or on or below a hillside, you should know your barangay's evacuation route and heed all instructions from your local government unit immediately — do not wait for floodwaters to enter your home before acting. For a full explanation of how PAGASA communicates risk levels, including rainfall color-coded warnings and storm signals, read our guide on how to read PAGASA's weather warnings.
What Today's Weather Means for You
Commuters
Metro Manila and other urban areas in Luzon should expect slow-moving traffic, flooded underpasses, and reduced visibility during the day's heaviest downpours. Leave earlier than usual, keep an emergency kit in your vehicle or bag, and check real-time flood alerts from your local disaster risk reduction office before heading out. If floodwaters on your route reach knee-level or higher, turn around — do not attempt to wade or drive through.
Fisherfolk and Small-Boat Operators
Coastal waters from Luzon to Visayas are rated slight to moderate, with southwest to westerly winds at light to moderate strength. These conditions may already be at the edge of what smaller vessels can safely handle, especially in exposed waters near Palawan and Occidental Mindoro where the monsoon is most intense today. PAGASA's wind and wave data advises caution. If in doubt, stay ashore.
Farmers
Moderate to heavy and possibly intense rainfall across Luzon's agricultural provinces poses waterlogging and soil erosion risks for crops. Farmers in hillside areas — particularly in Palawan, Occidental Mindoro, and elsewhere across Luzon — should secure harvested produce and drainage channels and avoid fieldwork during the heaviest rain periods. In Mindanao, isolated but potentially severe thunderstorms could bring brief but damaging downpours.
Students, Parents, and Schools
Classes in areas under heavy monsoon rain may be suspended by local governments — particularly in Palawan, Occidental Mindoro, and Metro Manila. Parents should monitor announcements from their school division offices and local LGUs. Avoid letting children walk to school through flooded or fast-moving water.
Outdoor Workers
Construction workers, delivery riders, market vendors, and others who work outdoors across Luzon and Visayas face a high-risk day. Seek shelter immediately during thunderstorms, avoid working near trees, scaffolding, or elevated structures in high winds, and watch for signs of flash flooding in your area. In Mindanao, severe thunderstorms — which PAGASA specifically mentions — can bring sudden lightning, damaging winds, and heavy rain within minutes.
Temperature Outlook
PAGASA recorded temperatures at its Science Garden station in Diliman, Quezon City for the 24-hour period ending at 8:00 PM on September 7, 2026. The maximum temperature reached 27°C (recorded at 1:00 PM) and the minimum was 24.9°C (at 10:00 AM). Relative humidity peaked at 92% and dropped to a minimum of 71% at 11:00 AM. These figures are from a single station and are most representative of Metro Manila conditions, but they give a useful benchmark: expect warm, humid, and muggy conditions between rain episodes across the country — typical for September in the Philippines.
The combination of high humidity and warm temperatures means that any extended outdoor activity between showers will feel uncomfortable, and heat-related fatigue remains a concern even on a rainy day.
Bottom Line
The single most important thing you should do today: check whether your home, school, or workplace lies in a flood- or landslide-prone area, and know your evacuation route — because the southwest monsoon is bringing widespread, heavy, and possibly intense rain to much of the Philippines on Tuesday, September 8, 2026, and flash floods can strike with almost no warning.
Monitor official PAGASA updates at pagasa.dost.gov.ph.