Current forecasts from Taiwan's Central Weather Administration indicate overnight lows in Taipei on September 23 around 23–27°C under partly cloudy to clear skies, with daytime highs near 31°C. Trader consensus clustering near 20–23°C reflects expectations of enhanced nocturnal radiative cooling, driven by the early northeast monsoon delivering drier air and reduced cloud cover that accelerates longwave heat loss from the surface. Historical September patterns show typical lows near 24°C, but late-month transitions often produce 2–4°C greater diurnal ranges when winds remain light and humidity drops. Key variables include exact cloud timing, urban heat island effects, and station-specific measurements that could shift the recorded minimum by 1–2°C. Updated model runs and official overnight observations will clarify resolution near the 20–23°C thresholds.