Persistent southwest monsoon (habagat) activity over Luzon is the dominant influence on Manila temperatures heading into August 21, driving cloudy skies, scattered showers, and thunderstorms that limit daytime heating. PAGASA outlooks indicate highs near 29–32 °C with 40–70 % rain chances, consistent with seasonal norms for the period when monsoon moisture and cloud cover typically suppress peaks below the 33–34 °C range seen in drier months. No tropical cyclones or strong high-pressure systems are expected to alter this pattern through the weekend, keeping conditions stable. Official resolution will rely on PAGASA station readings for the daily maximum, with any last-minute forecast shifts in monsoon strength or timing serving as the main variable for traders monitoring updated model guidance.