Persistent southwest monsoon (Habagat) flow over the Philippines is driving widespread cloud cover, scattered to heavy showers, and thunderstorms across Metro Manila through August 28, suppressing peak insolation and daytime heating. Official PAGASA guidance and ensemble forecasts show maximum temperatures most likely in the 28–31 °C range under these conditions, with high humidity and moderate-to-strong southwesterly winds further limiting surface warming through enhanced mixing and evaporative cooling. Model consensus remains tight on the monsoon regime, yet small differences in convective timing or brief breaks in cloud cover can shift realized maxima by 1–2 °C, explaining the closely matched market-implied odds across temperature bins. Updated model runs and PAGASA briefings over the next 48 hours will be the key catalysts for any repricing.