**Trader sentiment for Manila’s September 21, 2026 minimum temperature reflects a tight range centered on 25–27 °C, driven by typical southwest-monsoon conditions and modest forecast uncertainty in overnight cooling.** Official PAGASA guidance and multiple models (including GFS-based and international ensembles) indicate partly cloudy to cloudy skies with isolated rain showers or thunderstorms persisting through the night. High humidity (often 85–95 %) and light variable winds limit radiational cooling, keeping the overnight low near the seasonal September average of roughly 25 °C. Recent observations from the Science Garden station showed a 25 °C minimum the prior night, and current model runs project a similar floor of 24–26 °C, with some guidance allowing a brief dip toward 25 °C if clearer breaks develop after midnight. The market’s near-even odds between 25 °C, 26 °C, and 27 °C capture small differences in the timing and coverage of showers: more persistent cloud and rain would favor the lower end by suppressing temperature drops, while partial clearing could permit a slightly higher minimum. No strong cold surge, tropical cyclone, or anomalous dry spell is present to shift the outcome outside this narrow band, so trader consensus remains clustered around the climatological norm with limited upside or downside risk.