**Recent forecasts from multiple sources, including easeweather, Yr.no, and PAGASA regional outlooks, indicate nighttime minimum temperatures in Manila on September 1, 2026, are most likely to fall between 25–28°C.** This tight clustering explains why the leading market outcomes (28°C at 28.5%, 26°C and 27°C near 28% each, and 25°C at 25.5%) remain so evenly matched, reflecting genuine uncertainty in the precise overnight low amid ongoing monsoon conditions. The dominant driver is the active southwest monsoon (Habagat), enhanced by a distant tropical depression (Pilandok) east of Luzon. Persistent cloud cover, moderate-to-strong southwesterly winds, and scattered showers limit both daytime heating and nocturnal radiative cooling. Official PAGASA observations from late August show recent overnight lows near 25°C under similar conditions, while short-range model guidance points to minima around 26–27°C on the 1st amid 70–100% cloud cover and light-to-moderate rain. An ongoing moderate-to-strong El Niño in the Pacific provides broader context but has limited immediate influence on this 48-hour window. Model consensus supports the market-implied range; any shift would require clearer signals of reduced cloudiness or stronger winds that allow greater overnight cooling. Updated PAGASA and global model runs over the next day will be the key catalyst for traders.