QUEZON CITY, June 13, 2026 — The Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) has placed several regions on alert for flash floods and landslides as easterly winds push moisture-laden clouds into the eastern portions of the country, triggering scattered rains and thunderstorms expected to persist through the following day. The state weather bureau released its 24-hour public weather forecast at 4:00 AM on June 13, 2026, with validity running until 4:00 AM on June 14.
Mindanao's eastern regions, the Bicol peninsula, Eastern Visayas, and the Caraga region bear the greatest weather risk on this date, according to PAGASA. Moderate to at times heavy rainfall in these areas creates a real danger of flooding and soil movement, particularly in communities situated along river systems, coastal zones, and steep mountain slopes.
Dominant Weather System
PAGASA identified the easterlies — trade winds blowing in from the eastern Pacific — as the primary driver of weather activity across the archipelago on Saturday. These winds are channeling significant moisture into the eastern portions of Southern Luzon, the Visayas island group, and Mindanao, producing the bulk of rainfall activity forecast for the day.
In areas not directly under the influence of the easterlies — including Metro Manila and much of central and western Luzon — localized convective activity, or thunderstorm development that builds up during the warmer hours of the day, will be responsible for isolated rain showers and thunderstorms. This pattern is typical during this time of year, the weather bureau noted.
Luzon Weather Conditions
Bicol Region
PAGASA's forecast calls for cloudy skies with scattered rains and thunderstorms across the Bicol Region throughout the 24-hour forecast window. The combination of moderate and at times heavy downpours raises the risk of flash floods and landslides in this area. Provinces including Albay, Camarines Sur, Camarines Norte, Sorsogon, Catanduanes, and Masbate are all within the affected zone. Residents near rivers, coastlines, and hillside communities are strongly advised to stay alert and avoid landslide- or flood-prone areas during periods of intense rainfall.
Extreme Northern Luzon
The northernmost sections of Luzon — covering parts of the Ilocos Region, Cagayan Valley, and the Cordillera Administrative Region — will experience partly cloudy to cloudy skies with isolated rainshowers or thunderstorms, also linked to the easterlies. PAGASA cautioned that while conditions are less severe here than in the Bicol or eastern Mindanao areas, flash floods and landslides remain possible during intense thunderstorm episodes. Upland communities and those residing near river systems should keep a close watch on rainfall developments throughout the day.
Metro Manila and Remaining Luzon Provinces
The capital region and most other provinces in Luzon can expect partly cloudy to cloudy skies with isolated rainshowers or thunderstorms brought about by localized thunderstorm activity. Although rain probability is lower compared to the eastern regions, PAGASA still warned that flash floods and landslides are possible when severe thunderstorms occur. Urban flooding in Metro Manila continues to be a persistent concern during concentrated downpours, especially in low-lying barangays and areas with inadequate drainage infrastructure.
Visayas Weather Conditions
Eastern Visayas
Among the most significantly affected areas on Saturday is Eastern Visayas, encompassing Leyte, Southern Leyte, Samar, Eastern Samar, Northern Samar, and Biliran. PAGASA's forecast for the region is cloudy skies with scattered rains and thunderstorms, with an explicit warning about the risk of flash floods and landslides from moderate to at times heavy rainfall. This region has historically been vulnerable to rainfall-related disasters, and residents are urged to follow advisories from their local government units and take early precautionary measures where necessary.
Western Visayas Sections
The western coastal portions of the Visayas island group will see comparatively lighter weather, with partly cloudy to cloudy skies and isolated rainshowers or thunderstorms linked to the easterlies system. According to PAGASA, flash floods and landslides may still occur in these areas should severe thunderstorm events develop during the forecast period.
Mindanao Weather Conditions
Davao Region
The Davao Region is among the hardest-hit areas in Mindanao, with PAGASA forecasting cloudy skies with scattered rains and thunderstorms. The weather bureau explicitly flagged the danger of flash floods and landslides driven by moderate to at times heavy rainfall. Provinces covered under this forecast include Davao City, Davao del Norte, Davao del Sur, Davao Oriental, Davao Occidental, and Davao de Oro. Upland communities and those living near major river basins in the region are urged to remain on heightened alert and monitor official weather updates regularly.
Caraga Region
Northeastern Mindanao's Caraga region is under a comparable weather threat, with PAGASA projecting cloudy skies and scattered rains and thunderstorms for the area. Flash flood and landslide risks from moderate to at times heavy downpours similarly apply here. The provinces of Agusan del Norte, Agusan del Sur, Surigao del Norte, Surigao del Sur, and Dinagat Islands are all within the affected coverage, and communities in flood-prone valleys and areas with steep terrain are particularly urged to exercise caution.
Western Mindanao and Palawan
Western Mindanao and the island province of Palawan will see lighter conditions compared to the eastern sections, with partly cloudy to cloudy skies and isolated rainshowers or thunderstorms associated with the easterlies. PAGASA noted that flash floods and landslides remain a possibility during severe thunderstorm events in these zones as well.
Temperature and Humidity Readings
Data recorded at PAGASA's Science Garden weather station in Diliman, Quezon City during the 24-hour period ending at 8:00 PM on June 12 showed a peak temperature of 32.9°C at 11:00 AM and a low of 26.0°C recorded at 5:00 AM. Relative humidity readings fluctuated between a high of 94 percent and a low of 62 percent, consistent with the humid and muggy conditions characteristic of the Philippine wet season.
Wind Speed and Coastal Conditions
Winds across the Philippines are forecast to remain light to moderate on Saturday, according to PAGASA. Extreme Northern Luzon will receive winds from the south to southwest, while Palawan and the western coasts of Visayas and Mindanao will experience winds blowing from the southwest to south. The rest of the country can expect winds from the southeast to south.
Coastal sea conditions are generally manageable nationwide. Wave heights along Extreme Northern Luzon are forecast at 0.6 to 1.5 meters, while Palawan, western Visayas, western Mindanao, and remaining coastal areas can anticipate wave heights of 0.6 to 1.2 meters. PAGASA advised fisherfolk and operators of small watercraft to observe standard safety precautions given current sea states.
Astronomical Data and Tidal Predictions for Metro Manila
For Metro Manila on June 13, 2026, sunrise is scheduled at 5:27 AM and sunset at 6:26 PM. The moon will rise at 3:07 AM and set at 4:30 PM, with lunar illumination at only 4 percent, indicating that the moon is in a near-new moon phase. Tidal predictions for Manila Bay, sourced from the National Mapping and Resource Information Authority (NAMRIA), show a high tide of 1.2 meters at 7:43 AM and a low tide of -0.05 meters at 4:01 PM.
Public Safety Advisories
PAGASA is urging all residents — particularly those in flood-prone and landslide-prone communities across the Davao Region, Caraga, Eastern Visayas, and Bicol — to stay informed through official weather bulletins and to comply with any evacuation orders or safety directives issued by local government authorities. The public is also advised to avoid crossing swollen rivers, to keep emergency supplies on hand, and to check on elderly or vulnerable members of their communities during periods of heavy rainfall.
The weather bureau emphasized that conditions can change rapidly and encouraged all Filipinos to monitor PAGASA's official channels for updates throughout the forecast period and beyond.
Source: Philippine News Agency (PNA)