This outlook is published by PAGASA at 12nn of Friday, September 19th and valid until 12nn of Friday, September 26th.

SEPT. 20-21: CLOUDY SKIES WITH SCATTERED RAINS AND THUNDERSTORMS WILL BE EXPERIENCED OVER THE WESTERN SECTIONS OF SOUTHERN LUZON AND VISAYAS DUE TO THE SOUTHWEST MONSOON, AND OVER BICOL REGION AND QUEZON DUE TO TROPICAL CYCLONE "NANDO." ELSEWHERE, FAIR WEATHER CONDITIONS ARE EXPECTED, ASIDE FROM ISOLATED RAINSHOWERS OR THUNDERSTORMS.

SEPT. 22-23: STORMY WEATHER IS EXPECTED OVER ILOCOS REGION, CORDILLERA ADMINISTRATIVE REGION, AND CAGAYAN VALLEY DUE TO "NANDO." MOREOVER, SCATTERED RAINS AND THUNDERSTORMS ARE LIKELY OVER VISAYAS, THE WESTERN SECTION OF MINDANAO, AND THE REST OF LUZON DUE TO THE SOUTHWEST MONSOON. MEANWHILE, ISOLATED RAINSHOWERS OR THUNDERSTORMS ARE EXPECTED OVER THE REST OF MINDANAO.

SEPT. 24-25: CLOUDY SKIES WITH SCATTERED RAINS AND THUNDERSTORMS ARE LIKELY OVER LUZON, ESPECIALLY THE WESTERN SECTION, AND THE WESTERN SECTION OF VISAYAS DUE TO THE SOUTHWEST MONSOON. ELSEWHERE, ISOLATED RAINSHOWERS OR THUNDERSTORMS ARE EXPECTED.

SEPT. 26: THE SOUTHWEST MONSOON WILL AFFECT THE WESTERN SECTION OF LUZON, BRINGING SCATTERED RAINS AND THUNDERSTORMS. MEANWHILE, SCATTERED RAINS AND THUNDERSTORMS WILL AFFECT EASTERN VISAYAS AND CARAGA DUE TO A POSSIBLE LOW PRESSURE AREA (LPA) EAST OF VISAYAS.

In other words, Southwest Monsoon will be the dominant weather system throughout the entire period.

This weather outlook will be updated should there be significant changes in the forecast scenario through the issuance of 24-Hour Public Weather Forecasts and Weather Advisories.

SOURCE: https://bagong.pagasa.dost.gov.ph/weather/weather-outlook-weekly