**Persistent southwest monsoon (habagat) conditions dominate Manila's weather on August 28, 2026, driving high humidity, extensive cloud cover, and frequent scattered rains or thunderstorms that moderate overnight cooling.** Official PAGASA guidance highlights the southwest monsoon affecting Metro Manila with occasional rains, moderate-to-strong southwesterly winds, and a nearby low-pressure area east of Batanes, producing a narrow diurnal temperature range typical of the peak rainy season. Forecasts from multiple sources consistently point to nighttime lows in the 25–26 °C range, with recent observations showing minima near 26.4 °C the prior morning and model guidance holding similar values amid 90 %+ humidity and widespread cloudiness that reduces radiative heat loss. The near-even market-implied odds among 24 °C, 25 °C, and 26 °C (48.5 %, 48.5 %, and 44.5 %) reflect genuine uncertainty in the precise minimum, which depends on the intensity and timing of monsoon rains, wind-driven mixing, and any breaks in cloud cover during the pre-dawn hours when the daily low typically occurs. Stronger or more persistent rainfall tends to keep temperatures from dropping below 25 °C by enhancing downward longwave radiation and evaporative cooling limits, while clearer intervals could allow brief dips toward 24 °C. No major tropical cyclone is directly influencing the area, keeping the setup stable but variable within the monsoon regime. Traders are therefore pricing the outcome tightly around the climatological and current-model consensus of 24–26 °C.