**Persistent southwest monsoon (habagat) activity and widespread cloud cover with moderate-to-heavy rainfall are the dominant factors capping daytime heating in Metro Manila.** As of late August 28, PAGASA reports an active southwest monsoon flow across Luzon, with official forecasts for August 29 showing cloudy skies, scattered to occasional rains and thunderstorms, and southwest winds. This setup reduces solar insolation, keeping maximum temperatures suppressed relative to the typical August climatological average of ~30–31°C. **Model guidance and recent observations converge on a highest temperature of 27–29°C.** PAGASA’s regional outlook lists 25–27°C for August 29 in the Greater Metro Manila area, while international models (GFS-derived and others) cluster around 27–28°C (80–83°F) amid 90–100% rain probabilities and high humidity. On August 28, the observed maximum reached 31°C before heavier monsoon rain arrived; continued rain on the 29th is expected to limit afternoon peaks. The market’s implied probabilities—29°C at 43%, 28°C at 31%, and 30°C at 16%—reflect this consensus while allowing for modest variability in convective timing or brief breaks in cloud cover. **Resolution hinges on the official highest temperature recorded at PAGASA’s Science Garden station in Quezon City.** No major model disagreements appear in the latest runs, and the monsoon pattern is forecast to persist, supporting the tight clustering around 28–29°C.