MANILA, September 29, 2026 — A large portion of the southern Philippines is in for a wet and potentially dangerous Tuesday as the Intertropical Convergence Zone (ITCZ) continues to funnel widespread rain, thunderstorms, and flash flood conditions over Palawan, the Visayas, and Mindanao, according to the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA). The agency issued its weather forecast bulletin at 5:00 AM on September 29, 2026, valid through 5:00 AM on September 30.
Millions of Filipinos across the southern half of the country should expect disrupted travel, heightened flood risk in low-lying communities, and dangerous conditions at sea for small vessel operators. Northern and central Luzon, while spared the worst of the ITCZ's grip, are not entirely dry — localized afternoon thunderstorms remain possible.
What Is Driving Today's Weather?
The primary weather engine behind Tuesday's conditions is the Intertropical Convergence Zone, or ITCZ. In plain terms, the ITCZ is a broad belt near the equator where the trade winds from the northern and southern hemispheres meet. When these opposing air masses collide, they force warm, moisture-laden air upward, creating towering rain clouds and persistent, heavy rainfall over a wide area. Because the ITCZ sits across the Philippines today — specifically targeting Palawan, the Visayas, and Mindanao — those regions bear the brunt of its energy.
Unlike a tropical cyclone, which is a single rotating system, the ITCZ is a diffuse zone that can bring prolonged, multi-day rainfall across hundreds of kilometers simultaneously. This means relief may not come quickly for the affected southern regions.
For Luzon, PAGASA attributes the rain activity to localized thunderstorms — weather produced by the sun's heat building up moisture during the day, causing afternoon and evening downpours that tend to be shorter-lived but can still be intense within a small area.
Region-by-Region Forecast
Luzon
Northern Luzon and the rest of Luzon will experience partly cloudy to cloudy skies with light to moderate rain, isolated showers, and localized thunderstorms driven primarily by afternoon heating. While the weather here is far less severe than in the south, residents — particularly in areas prone to flooding or landslides — should still remain alert during afternoon and evening hours when thunderstorms are most likely to develop.
Coastal waters around Luzon carry slight to moderate wave heights, according to PAGASA's sea state forecast.
Visayas
The Visayas faces a split picture, but overall a significantly wetter day than Luzon. Western Visayas, Negros Island Region, and Central Visayas are under the heaviest influence of the ITCZ. PAGASA forecasts cloudy skies with scattered to widespread thunderstorms carrying heavy to intense rainfall. Flash floods and landslides are explicitly cited as risks for these areas, particularly in communities near rivers, coastal floodplains, and steep hillsides.
The rest of the Visayas — including areas in Eastern Visayas — can expect partly cloudy to cloudy skies with moderate to heavy rain and severe thunderstorms. Flash flooding remains possible even in these areas, and residents should not dismiss the warning simply because conditions are slightly less severe than in the western portions of the region.
Seas around the Visayas are forecast at slight to moderate wave heights.
Mindanao
Mindanao is among the hardest-hit island groups today. Zamboanga Peninsula, Noon Mindanao (SOCCSKSARGEN), Caraga, along with Palawan, fall into the highest-impact forecast category — cloudy skies with scattered to widespread thunderstorms, heavy to intense rain, and risks of flash floods and landslides. Communities in mountainous provinces and those near swelling rivers face the most acute danger.
The rest of Mindanao will see partly cloudy to cloudy skies with moderate to heavy thunderstorms, with flash flooding also possible. No part of Mindanao is fully clear of the ITCZ's reach today.
Coastal waters around Mindanao are at slight to moderate wave heights, as reported by PAGASA.
Decoding the Warnings: What Each Level Means
PAGASA's forecast explicitly flags the risk of flash floods and landslides for the most heavily affected areas — Western Visayas, Negros Island Region, Central Visayas, Zamboanga Peninsula, Noon Mindanao, Caraga, and Palawan. Flash flood risk is also noted for the rest of the Visayas and Mindanao, and for parts of Luzon under localized thunderstorm conditions.
While no formal color-coded rainfall warning or tropical cyclone wind signal is declared in this bulletin, the agency's explicit mention of flash flood and landslide risk in its impact column constitutes a clear operational warning for residents and local governments in those areas. If your community is in a low-lying area, a narrow valley, or near a mountain slope, treat this language as a direct call to prepare and stay alert.
For a full explanation of how PAGASA structures its weather alerts and what action each level requires from you, read our guide on how to read PAGASA's weather warnings.
Local government units in the highest-risk areas should activate their disaster preparedness protocols, particularly in barangays with histories of flash flooding and landslide incidents.
What It Means for You
Commuters
If you are traveling within or through Western Visayas, Negros Island, Central Visayas, Zamboanga Peninsula, or Mindanao today, expect heavy rain that may cause flooding on roads and reduced visibility due to thick cloud cover and downpours. Plan your travel earlier in the day where possible, allow extra time, and avoid underpasses, low-lying roads, and flood-prone routes. In Luzon, watch for sudden afternoon thunderstorms that can make roads slippery and visibility poor within minutes.
Fisherfolk and Small Boat Operators
PAGASA reports slight to moderate wave heights across the country's coastal waters on Tuesday. While these are not extreme sea states, the combination of moderate waves and active thunderstorms along Visayas and Mindanao coastlines means conditions can deteriorate quickly. Small boat operators, particularly those in the southern Philippines, are strongly advised to assess sea conditions before departing and stay close to shore. If thunderstorms develop while at sea, return to port immediately.
Farmers
For farmers in the Visayas and Mindanao, today's heavy rainfall could be a double-edged concern. While rain benefits dry crops, intense and prolonged downpours carry the risk of soil erosion, crop damage from flooding, and landslides on terraced or elevated farmland. Secure equipment and livestock, and avoid working on steep slopes during active rainfall. In Luzon, lighter and more localized rain is unlikely to cause widespread agricultural disruption, but localized flash flooding remains a concern in low-elevation farm areas.
Students, Parents, and Schools
Parents of students in schools across Western Visayas, Negros Island Region, Central Visayas, Zamboanga Peninsula, Caraga, and Noon Mindanao should monitor their local government unit's announcements regarding class suspensions, as flash flood conditions may prompt local officials to suspend classes. PAGASA's forecast of heavy to intense thunderstorms in these areas warrants close attention throughout the morning school hours and beyond. In Luzon, afternoon classes in areas prone to localized flooding may also be affected.
Outdoor Workers and Construction Sites
Workers at outdoor job sites — particularly construction workers, delivery personnel, and agricultural laborers — in the southern Philippines face the highest exposure risk today. Intense thunderstorms bring not only heavy rain but also lightning, strong gusty winds, and reduced visibility. Site supervisors in affected areas should be prepared to pause outdoor operations during active thunderstorms and implement lightning safety protocols. In Luzon, watch for the same risks during afternoon heating-driven storms.
Temperature and Humidity Outlook
PAGASA's observation data from the previous 24-hour period provides context for today's temperature range. At the main weather station, the maximum temperature recorded was 32.8°C and the minimum was 26.2°C. Relative humidity ranged from a maximum of 81% to a minimum of 55%.
For Tuesday, the widespread cloud cover brought by the ITCZ across the Visayas and Mindanao will keep daytime temperatures from rising too high in those regions, with increased humidity making conditions feel muggy and uncomfortable even without direct sun. In Luzon, where skies are partly cloudy and storm activity is more localized and short-lived, afternoon temperatures may feel warmer during cloud-free periods before any afternoon thunderstorms develop.
Bottom Line
Bottom line: If you live in, work in, or plan to travel through Palawan, the Visayas, or Mindanao today — Tuesday, September 29, 2026 — your single most important action is to identify whether your location is at risk of flash flooding or landslides, and if so, move to higher ground or a safer structure before heavy rain begins and stay there until conditions improve. Do not attempt to cross flooded roads or rivers. For the rest of the country, stay alert to sudden afternoon thunderstorms and avoid being in open areas during lightning activity.
Monitor official PAGASA updates at pagasa.dost.gov.ph.