QUEZON CITY, October 18, 2026 — Scattered rains, thunderstorms, and the risk of flash floods and landslides will affect several parts of the Philippines on Sunday, according to the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA). The agency's 4:00 AM forecast, valid until 4:00 AM on Monday, October 19, 2026, paints a wet picture for portions of Mindanao, Palawan, and Luzon, while the rest of the country can expect at least some cloudy skies and the chance of isolated showers throughout the day.
What Is Driving Today's Weather
Two weather systems are responsible for today's conditions nationwide. The Intertropical Convergence Zone (ITCZ) is affecting Palawan and the western section of Mindanao, while the easterlies are influencing the rest of the country.
The ITCZ is a broad belt near the equator where warm air masses from the northern and southern hemispheres meet. When these air masses collide, warm, moist air is forced upward, producing thick clouds, heavy rainfall, and thunderstorms. It is a persistent feature of the tropics and can bring prolonged and intense rain to the areas it covers.
The easterlies, meanwhile, are prevailing winds blowing in from the Pacific Ocean toward the Philippine islands. As these moisture-laden winds make landfall or move across the archipelago, they can lift air over terrain and coastlines, generating rainshowers and thunderstorms — particularly along exposed eastern and windward slopes.
Separately, PAGASA reports that Super Typhoon Champi (2630) is currently located 2,260 kilometers east of Southern Luzon, at coordinates 13.1°N, 144.6°E — well outside the Philippine Area of Responsibility (PAR). As of 3:00 AM today, it is packing maximum sustained winds of 185 km/h near the center and gusts of up to 230 km/h, moving west-northwestward at 25 km/h. PAGASA has not raised any wind signals or issued any warnings linking Champi to conditions inside the Philippines at this time. Readers should continue to monitor updates should the storm's track change.
Region-by-Region Forecast
Luzon
Two provinces in Luzon are under heightened weather concern today. Quezon and Camarines Norte — both facing the Pacific — are expected to experience cloudy skies with scattered rains and thunderstorms due to the easterlies. PAGASA warns that moderate to at times heavy rains in these areas could trigger flash floods or landslides. Residents in low-lying areas and communities near slopes and riverbanks in these provinces are advised to stay alert.
Metro Manila and the rest of Luzon not mentioned above can expect partly cloudy to cloudy skies, with isolated rainshowers or thunderstorms possible during the day. While conditions are generally lighter, PAGASA notes that severe thunderstorms may still produce localised flash flooding. Residents should not discount the possibility of a sudden, intense downpour.
Palawan is grouped with the areas most affected by the ITCZ. The province should brace for cloudy skies with scattered rains and thunderstorms, with moderate to heavy rainfall posing a risk of flash floods and landslides.
Visayas
The Visayas region falls under the broader "rest of the country" category in today's PAGASA forecast, which means residents can expect partly cloudy to cloudy skies with isolated rainshowers or thunderstorms. The easterlies are the influencing system. While conditions are not as severe as in Mindanao's western areas or the Bicol region, severe thunderstorms remain possible and could cause flash flooding in low-lying localities. Outdoor activities should be planned with this possibility in mind.
Mindanao
Mindanao is where the ITCZ's influence is most pronounced today. Zamboanga Peninsula, Basilan, Lanao del Sur, Lanao del Norte, and Misamis Occidental are forecast to have cloudy skies with scattered rains and thunderstorms driven by the ITCZ, with moderate to at times heavy rains. PAGASA explicitly flags the risk of flash floods and landslides in these areas. Residents, local government units, and disaster risk teams in these provinces should be on alert.
SOCCSKSARGEN and the rest of the Bangsamoro Autonomous Region in Muslim Mindanao (BARMM) — which includes Maguindanao del Norte, Maguindanao del Sur, Sultan Kudarat, Sulu, and Tawi-Tawi — are expected to see partly cloudy to cloudy skies with isolated rainshowers or thunderstorms. Flash floods and landslides are still identified as possible hazards during severe thunderstorms in these areas.
Decoding Today's Hazard Warnings
PAGASA has not raised a Tropical Cyclone Wind Signal for any part of the Philippines in today's forecast, as Super Typhoon Champi remains far outside PAR. However, the agency has identified flash flood and landslide risks tied to moderate to heavy rainfall in several specific areas.
Flash floods can occur rapidly — often within minutes of intense rainfall — in low-lying areas, near rivers, and in communities downstream from steep terrain. Landslides are a risk in mountainous or hilly areas with saturated soil. Residents in the named provinces should not wait for water to rise before acting; evacuation or movement to higher ground should happen early if heavy rain begins.
For a comprehensive guide on understanding the full range of PAGASA's weather alert levels, including rainfall color codes and storm signals, see how to read PAGASA's weather warnings.
Wind and Coastal Water Conditions
Winds across Luzon, Visayas, and the eastern section of Mindanao are forecast to be light to moderate, blowing from the northeast to east. Coastal waters in these areas will be slight to moderate, with wave heights ranging from 0.6 to 2.5 meters.
Over the rest of Mindanao, winds will also be light to moderate, coming from the southeast to northeast. Coastal waters there will be slight to moderate, with wave heights of 0.6 to 1.2 meters.
While these conditions are not at the roughest end of the scale, the 0.6-to-2.5-meter wave range for much of the country's coastline still warrants caution for those operating small watercraft.
What It Means for You
Commuters
If you are traveling through Quezon, Camarines Norte, Zamboanga Peninsula, Basilan, Lanao del Sur, Lanao del Norte, Misamis Occidental, or Palawan today, be prepared for heavy rain that may affect road conditions. Flash floods can render low-lying roads impassable quickly. Allow extra travel time, monitor local advisories, and avoid crossing flooded roads or bridges.
Fisherfolk and Small-Boat Operators
Coastal waters along most of the country will have wave heights reaching up to 2.5 meters in some areas, particularly along Luzon, Visayas, and eastern Mindanao. Small boat operators should exercise caution and assess conditions carefully before heading out. Those in areas where scattered rains and thunderstorms are forecast should be especially wary of sudden squalls at sea.
Farmers
Farmers in Palawan, Zamboanga Peninsula, and the provinces of Lanao del Sur, Lanao del Norte, and Misamis Occidental should anticipate moderate to heavy rains that could affect crops, particularly low-lying fields vulnerable to flooding. Farmers in Quezon and Camarines Norte face similar conditions. Secure equipment and harvested produce where possible.
Students and Parents
Families in the most rain-affected provinces — particularly Quezon, Camarines Norte, and the named Mindanao provinces — should check with local school authorities for any class suspensions or schedule changes, especially if severe thunderstorms are occurring in the morning. Even in Metro Manila and the broader "rest of the country" areas, sudden heavy showers are possible, so students should carry rain gear.
Outdoor Workers
Construction workers, delivery personnel, and others working outdoors in affected areas should take cover immediately during thunderstorms. Lightning is a serious hazard during severe thunderstorms, and flash flooding can develop rapidly. Workers in the identified high-risk provinces should coordinate with supervisors on safety protocols.
Temperature Outlook
PAGASA recorded a maximum temperature of 33.5°C at 2:00 PM and a minimum of 25.3°C at 5:00 AM at its weather station in Science Garden, Diliman, Quezon City, for the 24-hour period ending 8:00 PM on October 17, 2026. Relative humidity peaked at 90% at 5:00 AM and dropped to a minimum of 51% at 2:00 PM. These are reference readings for Metro Manila and reflect conditions at a single PAGASA monitoring station.
Astronomical and Tidal Information (Metro Manila)
For those near Manila Bay, today's tidal data shows a high tide of 1.02 meters at 1:30 AM and a low tide of -0.02 meters at 11:29 AM. Sunrise is at 5:48 AM and sunset at 5:35 PM. The moon rises at 12:04 PM and sets at 11:30 PM, with an illumination of 48%.
Bottom Line
If you live in or are traveling to Zamboanga Peninsula, Basilan, Lanao del Norte, Lanao del Sur, Misamis Occidental, Palawan, Quezon, or Camarines Norte, prepare for heavy rain and act early — do not wait for flooding to begin before seeking higher ground or adjusting your plans. Even in Metro Manila and other areas not flagged as high-risk today, isolated severe thunderstorms can still cause sudden, localised flooding. Keep watch on PAGASA's updates throughout the day.
Monitor official PAGASA updates at pagasa.dost.gov.ph.