Recent Central Weather Administration forecasts and ensemble models indicate overnight lows in Taipei for August 22 clustering near 26–27°C under typical late-summer conditions of high humidity, frequent cloud cover, and scattered showers or thunderstorms. Persistent moisture from the East Asian monsoon raises dew points, suppressing nocturnal radiative cooling and keeping minimum temperatures elevated compared to drier periods. Urban heat island effects and light winds further moderate drops, while any heavier rainfall could briefly enhance cooling toward 25°C. With leading market outcomes tightly bunched, traders appear to weigh minor variations in forecast cloud timing and precipitation intensity, consistent with historical August minima around 26°C. Updated model runs and official briefings through the evening of August 21 remain key near-term catalysts.