Recent forecasts from Taiwan's Central Weather Administration and international models indicate persistent low-pressure influences and widespread thunderstorms across northern Taiwan through early September, creating substantial uncertainty in overnight radiative cooling for Taipei on September 3. Heavy cloud cover and rainfall typically limit daytime heating while also trapping heat at night, supporting minimum temperatures near the 23–25°C historical September baseline, yet model runs diverge on potential northerly wind shifts or brief clear spells that could dip lows to 22°C or below. Conversely, sustained humidity and weak steering patterns raise the slim possibility of warmer conditions persisting. This scientific ambiguity in short-range ensemble guidance and steering flow explains the near-even market-implied odds between the cooler and warmer extremes, with traders weighting incoming CWA updates and refined model consensus ahead of the date.