The closely matched market-implied odds favoring 27–29°C reflect the dominant influence of the southwest monsoon, or Habagat, which delivers persistent cloud cover, high humidity, and scattered showers that typically suppress maximum temperatures a few degrees below seasonal averages. Official PAGASA outlooks for August 5 indicate a 26–30°C range with 60–90% rain probability, consistent with historical early-August patterns where frequent precipitation limits peak heating despite tropical baseline conditions near 31°C. Short-term model consensus shows limited day-to-day variability, though localized timing of thunderstorms introduces uncertainty in exact highs, with new forecast updates expected to refine resolution thresholds ahead of market close.