Persistent southwest monsoon activity across Metro Manila is the dominant factor capping daily maximum temperatures near 29–30°C for August 6, according to PAGASA guidance showing forecast highs of 30–31°C amid 80–90% rain probabilities. Cloud cover and frequent showers reduce surface heating by limiting solar insolation, a common climatological feature of the July–September Habagat season that historically keeps Manila’s August peaks 1–3°C below the drier-month average. Recent low-pressure systems and enhanced moisture convergence have reinforced this pattern, aligning with the market’s heavy weighting toward 28–30°C outcomes while rendering 32°C-plus readings unlikely absent a rapid monsoon break. Updated model runs and the next PAGASA daily bulletin remain the key near-term catalysts for any shift in implied probabilities.