QUEZON CITY, September 14, 2026 — Filipinos from Batanes down to Mindanao should brace for isolated rainshowers and thunderstorms throughout Monday, with the state weather bureau warning that severe episodes could bring flash floods and landslides to vulnerable communities. The Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) issued the advisory at 4:00 AM, valid until 4:00 AM on Tuesday, September 15.
While no tropical cyclone is threatening the archipelago at this time, the weather pattern affecting the country today is still enough to pose real risks — particularly for residents near low-lying flood plains, mountain slopes, and poorly drained urban areas like parts of Metro Manila.
What Is Driving Today's Weather?
PAGASA identifies two weather drivers at work on September 14. The first is the easterlies, which are affecting Extreme Northern Luzon — specifically the Batanes and Babuyan Islands group. The easterlies are trade winds that blow in from the Pacific Ocean toward the Philippine landmass. When they carry enough moisture, they can trigger cloud buildup and occasional rainshowers or thunderstorms, particularly over elevated terrain.
For the rest of the country — including Metro Manila, all other parts of Luzon, the Visayas, and Mindanao — the culprit is localized thunderstorms. These are heat-driven storm cells that develop when warm, humid air near the surface rises rapidly into the atmosphere, cools, and condenses into towering storm clouds. They tend to pop up in the afternoon and early evening and can be intense even if brief, producing heavy rainfall, strong gusty winds, and lightning in a short period.
Taken together, the picture for Monday is one of generally fair-to-cloudy mornings giving way to scattered afternoon and evening showers or thunderstorms across the entire country — a familiar pattern during the transition between the southwest monsoon season and the cooler months ahead.
Region-by-Region Forecast
Luzon
Batanes and Babuyan Islands — the northernmost tip of the Philippines — will see partly cloudy to cloudy skies with isolated rainshowers or thunderstorms throughout the day, driven by the easterlies. Residents in these island communities, accustomed to changeable weather, should nonetheless take care during any active thunderstorm period, as PAGASA flags the possibility of flash floods or landslides in the event of severe storms.
Metro Manila and the rest of Luzon will also contend with partly cloudy to cloudy skies interspersed with isolated rainshowers or thunderstorms, this time attributed to localized thunderstorm development. The same flash flood and landslide hazard applies. Metro Manila residents — especially those in historically flood-prone barangays in Marikina, Malabon, Navotas, and low-lying parts of Pasay and Parañaque — should keep an eye on conditions, particularly in the afternoon.
Winds over Luzon will blow from the northeast to northwest at light to moderate speeds. Coastal waters off Luzon will be slight to moderate, with wave heights ranging from 0.6 to 2.1 meters.
Visayas
The Visayas region — covering the island groups of Samar, Leyte, Cebu, Bohol, Negros, Panay, and surrounding areas — will experience partly cloudy to cloudy skies with isolated rainshowers or thunderstorms caused by localized convection. Flash floods and landslides remain a concern during any severe thunderstorm episode.
Winds will blow from the northwest to southwest at light to moderate intensity. Coastal waters will be slight to moderate, with wave heights of 0.6 to 2.1 meters.
Mindanao
Mindanao, including the Caraga region, Northern Mindanao, the Davao region, Soccsksargen, the Zamboanga Peninsula, and the Bangsamoro Autonomous Region in Muslim Mindanao (BARMM), will see the same general pattern: partly cloudy to cloudy skies with isolated rainshowers or thunderstorms, carrying the risk of flash floods and landslides in severe cases.
Like the Visayas, winds over Mindanao will come from the northwest to southwest at light to moderate speeds. Coastal waters will also be slight to moderate, with wave heights ranging from 0.6 to 2.1 meters.
Decoding the Hazard Warnings
PAGASA does not have an active tropical cyclone wind signal for any part of the country on September 14. There are also no active color-coded rainfall warnings issued in this particular forecast bulletin. However, PAGASA explicitly flags the risk of flash floods and landslides during severe thunderstorms for all areas — a hazard advisory that applies nationwide.
This is not a formal color-coded rainfall warning but it is a meaningful caution: when a localized thunderstorm intensifies, it can dump a large volume of rain in a very short time over a small area, quickly overwhelming drainage systems and triggering flash floods even in places that have not seen sustained rainfall all day. Landslide-prone communities — those on or near steep slopes with loose or already-saturated soil — are at heightened risk whenever severe thunderstorms occur.
If you are unsure how PAGASA's various warning systems work and what actions they require, read our guide on how to read PAGASA's weather warnings for a full breakdown of rainfall color codes, tropical cyclone wind signals, and heat-index categories.
What It Means for You
Commuters
Expect traffic to worsen significantly if thunderstorms strike during afternoon rush hours, which is the most likely timing for localized storm development. If you commute by motorcycle or bicycle, carry rain gear and consider adjusting your schedule to leave earlier or wait out peak storm activity. Flash flooding can make underpasses and low-lying roads impassable in minutes — do not attempt to cross flooded roads on foot or by vehicle.
Fisherfolk and Small-Boat Operators
Wave heights of 0.6 to 2.1 meters are forecast for coastal waters around Luzon, Visayas, and Mindanao. While the lower end of this range (slight seas) is generally manageable for larger bancas, the upper end (moderate seas at 2.1 meters) can be dangerous for small and motorized outrigger boats. PAGASA advises caution. Fisherfolk should monitor conditions closely before heading out and prioritize returning to port before afternoon thunderstorms develop, as storms at sea can escalate quickly.
Farmers
Isolated thunderstorms can be uneven — one barangay gets heavy rain while the next stays dry. Farmers should secure lightweight equipment, harvested crops, and materials that can be damaged by strong winds or heavy rain accompanying thunderstorms. Those in low-lying farm areas near rivers or in mountainous terrain should be alert to the flash flood and landslide risk flagged by PAGASA.
Students, Parents, and Schools
Classes are not suspended under the current PAGASA forecast, as there are no active storm signals. However, parents should prepare students with rain gear, and schools should review their protocols for handling sudden severe thunderstorm events during school hours or dismissal time. Heavy rain in a short burst can make walking to and from school treacherous if drainage is overwhelmed.
Outdoor Workers and Construction Teams
Workers on elevated structures — scaffolding, rooftops, electrical lines — are especially vulnerable to lightning during thunderstorms. The standard safety rule applies: if you hear thunder, seek shelter immediately and do not resume outdoor work until at least 30 minutes after the last thunderclap. Supervisors should have a clear storm suspension protocol in place before the afternoon period.
Temperature and Humidity Outlook
PAGASA's weather station at Science Garden in Diliman, Quezon City recorded a maximum temperature of 31.6°C at 2:00 PM yesterday and a minimum of 25.2°C at 8:00 AM. Relative humidity ranged from a high of 89% to a low of 63%.
The combination of temperatures in the low 30s and relative humidity approaching 90% creates a felt temperature — or "heat feel" — that is noticeably higher than the thermometer reading, particularly during morning hours before any rain arrives. Outdoor workers and those without air conditioning should stay hydrated and take shade breaks, especially between 10:00 AM and 3:00 PM when solar heating is at its peak.
Sunrise over Metro Manila today is at 5:45 AM and sunset at 5:59 PM, giving about 12 hours and 14 minutes of daylight. The moon is only at 12% illumination (a waxing crescent), meaning nights will be dark — a consideration for residents in areas with poor street lighting who may be caught outdoors during or after evening thunderstorm episodes.
Bottom Line
The bottom line for Monday, September 14: Isolated but potentially severe afternoon and evening thunderstorms are possible across the entire Philippines, from Batanes to Mindanao. The single most important thing to do today is prepare for a heavy, fast-moving downpour — keep rain gear handy, avoid flood-prone routes during storms, and stay away from exposed elevated areas if thunder is heard. There is no typhoon threat today, but localized thunderstorms can be just as dangerous when they are severe.
Monitor official PAGASA updates at pagasa.dost.gov.ph