The Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) released its official weather forecast for Monday, January 12, 2026, warning of widespread rain over large portions of Luzon due to the combined effects of the Shear Line, the Northeast Monsoon, and the Easterlies.
According to PAGASA, the Shear Line continues to affect the eastern sections of Northern and Central Luzon, bringing cloudy skies with scattered rains and isolated thunderstorms over Cagayan, Isabela, Aurora, and Quezon. Weather forecasters caution that rainfall in these areas may become moderate to heavy at times, which could lead to possible flash floods and landslides, especially in low-lying communities and mountainous locations.
Meanwhile, the Northeast Monsoon or Amihan is influencing the Cordillera Administrative Region and the rest of Cagayan Valley, producing cloudy skies with light rains. No significant impacts are expected in these areas. The same weather system is affecting Metro Manila, the Ilocos Region, and the remaining portions of Central Luzon, where residents can expect partly cloudy to cloudy skies with isolated light rains.
For the rest of the country, Easterlies will prevail, resulting in partly cloudy to cloudy skies with isolated rainshowers or thunderstorms. PAGASA warned that severe thunderstorms may trigger localized flooding or landslides, particularly in vulnerable communities.
In terms of marine conditions, Northern Luzon and the eastern sections of Central and Southern Luzon will experience moderate to strong northeast winds, causing moderate to rough coastal waters ranging from 2.5 to 4.0 meters. The rest of Luzon, along with the eastern portions of the Visayas and Mindanao, will also see moderate to strong winds and sea waves of 1.5 to 2.8 meters. Other areas of the country will have light to moderate winds and slight to moderate seas measuring 0.6 to 1.8 meters.
Temperature records for the previous 24 hours showed a minimum of 23.2°C at 6:00 AM and a maximum of 30.2°C at 2:00 PM, while relative humidity ranged from 60 percent to 93 percent.
As of 2:00 AM, PAGASA confirmed that no Low Pressure Area is being monitored for possible tropical cyclone formation. Meanwhile, final General Flood Advisories were issued for MIMAROPA, Bicol Region, and Eastern Visayas, signaling improving conditions but continued vigilance.