The Southwest Monsoon, or Habagat, continues to dominate Metro Manila with persistent cloud cover, scattered rains, and thunderstorms, anchoring trader expectations for a peak temperature near 31–32°C on August 21. This pattern suppresses maximum solar heating through reduced insolation while enhancing evaporative cooling and latent heat release from convection, which typically caps daytime highs at or slightly above the 30°C seasonal average. PAGASA guidance and ensemble models show limited variability, with any brief breaks in cloudiness or delayed afternoon showers the main factors that could nudge readings to 33°C; conversely, heavier or earlier precipitation would favor the lower side near 30°C. High humidity and light winds further constrain extremes, aligning market-implied odds with observed monsoon dynamics rather than drier or clearer regimes.