The active southwest monsoon (habagat) remains the dominant driver of trader sentiment for Manila’s August 28 overnight low, sustaining widespread cloud cover, scattered to moderate thunderstorms, and elevated humidity that suppresses radiative cooling. Persistent southwesterly flow and high moisture content limit the diurnal temperature range, keeping most official guidance clustered around 24–26 °C, consistent with climatological August minima near 25 °C. Recent model runs and PAGASA outlooks show modest spread tied to the timing and intensity of convective bursts, creating roughly equal market-implied odds across adjacent bins. Urban heat-island effects and variable wind speeds add further uncertainty to the precise dawn minimum, with new forecast updates expected to tighten probabilities ahead of resolution.