Trader sentiment for Taipei's lowest temperature on September 11 centers on the 23–24°C range amid closely matched implied probabilities, reflecting uncertainty in overnight cooling under persistent easterly flow and scattered showers. Central Weather Administration guidance and ensemble models indicate a minimum near 25°C, with cloud cover and high humidity (often above 85%) limiting radiative cooling while light to moderate winds prevent stronger drops. Recent weakening of seasonal northeasterlies has allowed slightly warmer air advection, yet localized rain and variable model runs introduce divergence that could push readings toward 21–22°C in sheltered areas or hold them near 24°C. Upcoming real-time observations from official stations will resolve these thresholds.