QUEZON CITY, June 8, 2026 — The Southwest Monsoon, known locally as the Habagat, is driving scattered rains and thunderstorms across the western portions of Northern and Central Luzon on Monday, with flash floods and landslides a real concern for communities in the Ilocos Region and Zambales. Meanwhile, isolated downpours triggered by localized thunderstorms threaten the rest of the Philippines, including Metro Manila, the Visayas, and Mindanao.
The Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) issued its 24-hour public weather forecast at 4:00 AM on June 8, 2026, valid until 4:00 AM on Tuesday, June 9, 2026. The agency's bulletin paints a picture of a country under broadly unsettled skies — the result of two distinct weather drivers working simultaneously across the archipelago.
What Is Causing Today's Weather?
PAGASA identified the Southwest Monsoon as the primary weather system currently affecting the Philippines. The monsoon, a seasonal wind pattern that typically prevails from June through September, is funneling moisture-laden air into the western sections of Northern and Central Luzon. This is the same weather pattern that historically brings prolonged wet conditions to the country's western-facing coastlines during the rainy season.
Separately, localized thunderstorm activity — driven by heat and atmospheric instability rather than a large-scale weather system — is responsible for the isolated rain showers and thunderstorms expected in Metro Manila and the rest of the country. These storms are less widespread than monsoon rain but can still be intense and fast-developing, particularly in the afternoon and evening hours.
Luzon: Heaviest Rain in Ilocos and Zambales
PAGASA's forecast singles out the Ilocos Region and Zambales as the areas facing the most significant weather hazards on June 8. Both areas will experience cloudy skies with scattered rains and thunderstorms, a direct consequence of the Southwest Monsoon's grip on western Luzon.
The agency explicitly warns of the possibility of flash floods or landslides in these localities due to moderate to at times heavy rains. Residents living near rivers, low-lying areas, and hilly or mountainous terrain in the Ilocos Region — which encompasses Ilocos Norte, Ilocos Sur, La Union, and Pangasinan — as well as in the province of Zambales, are advised to stay alert and heed any local government warnings.
Communities in the Cordillera Administrative Region (CAR) and other parts of Northern Luzon not specifically named in PAGASA's bulletin should also remain cautious, as the monsoon's reach can be variable and localized conditions may differ from the broader forecast.
Metro Manila and the remainder of Luzon fall under a separate forecast category: partly cloudy to cloudy skies with isolated rain showers or thunderstorms. While not as persistently wet as the Ilocos Region and Zambales, PAGASA cautions that flash floods and landslides are still possible in Metro Manila and nearby provinces during severe thunderstorms. Afternoon thunderstorms that form quickly can dump significant amounts of rain in a short period, overwhelming drainage systems in urban areas.
Visayas: Partly Cloudy With Isolated Storms
Across the Visayas — encompassing the island groups of the Eastern, Central, and Western Visayas — residents can expect partly cloudy to cloudy skies with isolated rain showers or thunderstorms throughout the forecast period. PAGASA attributes these weather disturbances to localized thunderstorm activity rather than a large organized weather system.
The weather hazard concern for the Visayas mirrors that of Metro Manila: flash floods and landslides remain possible should any of these localized thunderstorms intensify significantly. Residents in hilly and low-lying areas of provinces such as Leyte, Samar, Cebu, Negros, Iloilo, and the Antique should keep a close watch on rapidly changing sky conditions, particularly in the afternoon, when thunderstorms tend to peak in intensity.
Mindanao: Mostly Fair but Watch for Storms
Mindanao is also under the partly cloudy to cloudy with isolated rain showers or thunderstorms forecast — the same general outlook that covers the majority of the Philippines outside the monsoon-affected western Luzon areas. Localized thunderstorms remain the culprit here, and the flash flood and landslide advisory during severe thunderstorms applies equally to Mindanao's provinces.
Given Mindanao's topography — with significant mountain ranges, river systems, and areas historically prone to flash flooding — PAGASA's advisory should not be taken lightly, even when the broader forecast sounds relatively benign. Residents in areas such as Davao, Bukidnon, Lanao del Norte and del Sur, and the Caraga Region should monitor local conditions carefully.
Wind and Sea Conditions
PAGASA also issued wind and coastal water advisories as part of Monday's forecast. Conditions vary significantly between the northernmost tip of the country and the rest of the archipelago.
Over Extreme Northern Luzon — covering the seaboards and coasts of Batanes and the northernmost portions of Cagayan province — winds are blowing from the south to southwest at moderate speeds. Coastal waters in this area are described as moderate, with wave heights ranging from 1.2 to 2.5 meters. These conditions can be challenging for small fishing vessels and bangkas, and mariners operating in this zone are strongly advised to exercise caution.
For the rest of the country, winds are coming from the southeast to southwest at light to moderate intensity. Coastal waters are classified as slight to moderate, with wave heights of 0.6 to 1.5 meters. While less severe than Extreme Northern Luzon, these conditions can still affect small watercraft and fisherfolk, and those planning sea travel should check conditions before departure.
Temperature Outlook
PAGASA reported the temperature extremes recorded at its official weather station at Science Garden in Diliman, Quezon City, for the 24-hour period ending at 8:00 PM on June 7, 2026 (yesterday). The maximum temperature reached 33.3°C at 2:00 PM, while the minimum was 25.6°C at 5:00 AM. Relative humidity peaked at 91% at 5:00 AM and dipped to a low of 51% at 2:00 PM.
These figures reflect the warm and humid conditions typical of the Philippine rainy season, where high overnight humidity and daytime heat combine to fuel the afternoon and evening thunderstorms that PAGASA has forecast for much of the country.
Astronomical and Tidal Information
For those planning outdoor activities in Metro Manila, sunrise today is at 5:26 AM and sunset at 6:24 PM, giving residents just under 13 hours of daylight. The moon rises at 11:44 AM and is currently at 49% illumination, approaching the first quarter phase.
PAGASA, in coordination with the National Mapping and Resource Information Authority (NAMRIA), also reported tidal predictions for Manila Bay. A high tide of 0.99 meters is expected at 2:45 PM today, followed by a low tide of 0.13 meters at 11:08 PM. Coastal communities and those in low-lying areas near Manila Bay should factor in these tidal movements, particularly when combined with rainfall runoff during afternoon thunderstorms.
Safety Reminders for June 8
Given today's forecast, PAGASA's advisories carry practical implications for millions of Filipinos across the country. Here is what residents should keep in mind:
For residents of the Ilocos Region and Zambales: The risk of flash floods and landslides is elevated. Avoid low-lying areas, riverbanks, and steep hillsides during and after heavy rain. Coordinate with your local government unit (LGU) for evacuation procedures if needed.
For Metro Manila and the rest of Luzon, the Visayas, and Mindanao: While rain may be isolated, localized thunderstorms can develop rapidly and produce intense downpours. Avoid unnecessary travel during peak afternoon storm hours. Secure loose objects and stay indoors during lightning activity.
For fisherfolk and mariners: Those operating in the waters off Extreme Northern Luzon should exercise particular caution given wave heights of up to 2.5 meters. Small vessel operators everywhere should check coastal water advisories before heading out.
"The Southwest Monsoon is affecting the western sections of Northern and Central Luzon," PAGASA stated in its 4:00 AM bulletin issued on June 8, 2026, warning of possible flash floods and landslides due to moderate to at times heavy rains in the Ilocos Region and Zambales.
Weather conditions can change rapidly, especially during the rainy season. PAGASA issues updated bulletins throughout the day, and residents across the Philippines are encouraged to stay informed through official channels.
Monitor official PAGASA updates at pagasa.dost.gov.ph.