Current forecasts from Taiwan’s Central Weather Administration and models show Taipei’s minimum temperature on August 21 likely settling near 25–27°C amid persistent low-pressure systems driving widespread showers and thunderstorms. High humidity and extensive cloud cover limit nocturnal radiative cooling, keeping overnight lows above seasonal norms for clear-sky nights while preventing deeper drops. This uncertainty between a 26°C floor and potential cooling to 21°C or below if convection weakens later accounts for the tight market split, with traders weighing real-time observational updates against historical August averages around 26–27°C. Fresh model runs and station readings tonight remain the key near-term catalysts.