Recent forecasts from Central Weather Administration models and ensemble runs point to a highest temperature in Taipei on September 12 most likely between 29–33°C, driven by persistent northeasterly monsoon flow, scattered showers, and variable cloud cover that moderate daytime heating under typical early-autumn humidity levels near 70–80%. This range aligns closely with September climatology of 30–31°C average highs, with no active typhoon steering patterns or strong subsidence to push extremes higher. Recent weakening of seasonal winds and a distant South China Sea tropical depression add minor uncertainty to precipitation timing, which could alter peak readings by 1–2°C depending on afternoon clearing. Refined CWA guidance and next model cycles will refine these probabilities ahead of market resolution.