The Philippine Atmospheric, Geophysical, and Astronomical Services Administration (PAGASA) has issued a weather forecast indicating the possibility of isolated thunderstorms across the Philippines. The 4:00 AM update, issued on May 21, 2026, advises residents nationwide to stay informed and prepared for potential flash floods and landslides associated with these weather disturbances.
National Weather Overview
Across the Philippines, PAGASA forecasts partly cloudy to cloudy skies with isolated rainshowers or thunderstorms. These conditions are attributed to easterlies affecting Luzon and Visayas, and localized thunderstorms across Mindanao. The primary concern is the potential for flash floods and landslides during severe thunderstorms, particularly in areas prone to these hazards.
Regional Forecasts
Luzon
Metro Manila and the rest of Luzon are expected to experience partly cloudy to cloudy skies with isolated rainshowers or thunderstorms. Residents should be aware of the possibility of flash floods and landslides, especially in low-lying areas and near waterways. PAGASA advises monitoring updates and taking necessary precautions, such as avoiding travel during heavy downpours and securing belongings.
Visayas
Similar to Luzon, the Visayas region will also have partly cloudy to cloudy skies with isolated rainshowers or thunderstorms. The easterlies are contributing to these conditions, increasing the likelihood of localized heavy rainfall. People in the Visayas are advised to exercise caution and be prepared for potential disruptions due to severe weather.
Mindanao
Mindanao is forecast to have partly cloudy to cloudy skies with isolated rainshowers or thunderstorms caused by localized thunderstorms. While the weather system is different from Luzon and Visayas, the potential impacts remain the same. Residents are encouraged to stay informed and take necessary safety measures to mitigate the risks associated with flash floods and landslides.
Wind and Coastal Water Conditions
PAGASA also provides information on wind and coastal water conditions across the country:
- Northern Luzon: Light to moderate winds from the east to southeast, with slight to moderate coastal waters (0.6 to 1.2 meters).
- Visayas and the rest of Luzon: Light to moderate winds from the east, with slight to moderate coastal waters (0.6 to 1.2 meters).
- Mindanao: Light to moderate winds from the northeast to north, with slight to moderate coastal waters (0.6 to 1.2 meters).
Mariners and those engaged in coastal activities are advised to take note of these conditions and exercise caution.
Temperature and Humidity
Yesterday's (May 20, 2026) extreme temperatures recorded at the PAGASA Weather Station in Quezon City were a maximum of 33.2°C at 11:00 AM and a minimum of 24.8°C at 5:00 AM. The relative humidity ranged from 93% at 2:00 AM to 51% at 11:00 AM.
Safety Precautions and Reminders
Given the forecast for isolated thunderstorms, it is crucial to take the following safety precautions:
- Stay Informed: Monitor PAGASA updates and local news for the latest weather information and advisories.
- Avoid Flood-Prone Areas: If you live in a flood-prone area, be prepared to evacuate if necessary.
- Secure Your Home: Reinforce your home and secure loose objects that could be blown away by strong winds.
- Prepare an Emergency Kit: Have a readily available emergency kit containing essential supplies such as food, water, medicine, and a flashlight.
- Be Cautious While Driving: If you must drive, be aware of potential hazards such as flooded roads and reduced visibility.
- Stay Indoors During Thunderstorms: Seek shelter indoors during thunderstorms and avoid contact with electrical appliances and metal objects.
Tidal Information
PAGASA, courtesy of NAMRIA, provides tidal predictions for Manila Bay. Today, May 21, 2026, high tide occurred at 12:40 PM (1.37 meters) and low tide at 9:48 PM (-0.26 meters).
Sunrise and Sunset
Today's sunrise was at 5:27 AM, and sunset will be at 6:18 PM. The moonrise was at 9:45 AM and moonset at 11:02 PM with 28% illumination.
Monitor official PAGASA updates at pagasa.dost.gov.ph.