**Stable subtropical conditions and clear skies are keeping the overnight low in Taipei near 22–24°C on September 21, with model consensus pointing to a minimum in the low-to-mid 20s rather than an extreme cool or warm outlier.** Current forecasts from sources including WindBorne Systems, weather models, and the Central Weather Administration show mostly clear to partly cloudy skies, light northeasterly winds of 5–10 km/h, and high pressure around 1013–1015 hPa. These favor moderate radiative cooling overnight but limit it due to humidity levels near 80–90% and residual warmth from daytime highs of 28–30°C. September climatology for Taipei places typical daily minima around 23–25°C, and the absence of fronts, typhoons, or strong monsoon surges supports values close to this baseline. The near-even market split between sub-19°C and 28°C+ outcomes reflects genuine short-term forecast uncertainty in nocturnal minimums, where small differences in cloud cover, wind, or urban heat effects can shift the exact low by a few degrees. New runs from global models (GFS, ECMWF) and local CWA updates over the next 48 hours will likely narrow the range ahead of resolution.