Official forecasts from Taiwan's Central Weather Administration and international models indicate a minimum temperature near 23–24°C in Taipei on September 21 under mostly clear to partly cloudy skies with light easterly winds. These conditions favor moderate overnight radiative cooling typical of late September's subtropical transition, when daytime highs of 28–30°C give way to dew points around 21–23°C that limit further drops. Trader consensus clusters on 23–25°C because model ensembles show tight agreement on the overnight minimum, with small uncertainties from local urban heat retention or minor cloud variations potentially shifting the exact low by 1°C. No significant weather systems are expected to alter this pattern before resolution.