Recent forecasts from Taiwan’s Central Weather Administration and regional models show a high near 30–31 °C in Taipei on September 9 under the leading edge of the season’s first northeast monsoon surge. Easterly flow, increased low-level moisture, and scattered showers are expected to boost cloud cover and reduce solar heating while enhancing evaporative cooling, keeping maxima below the clearer-day peaks seen earlier in the week. Ensemble guidance shows tight clustering around these values, with modest spread tied to exact timing of shower bands and boundary-layer mixing. Traders appear to weigh the official 24–31 °C range and historical September analogs heavily, while noting that any unexpected clearing or delayed monsoon reinforcement could push the daily maximum into the low 32 °C range. Updated CWA briefings and next model cycles will refine resolution criteria before market close.