Traders assign nearly equal weight to 34°C and 35°C maxima because short-range numerical weather prediction models show a tight cluster of solutions near those values for August 23, reflecting modest uncertainty in the strength of daytime insolation versus afternoon convective cooling. Subtropical monsoon conditions over the Pearl River Delta produce high boundary-layer moisture that favors scattered thunderstorms, which can cap temperatures through cloud shading and evaporative cooling, while clear breaks allow surface heating to push readings into the mid-30s. Recent model runs indicate stable steering flow with limited large-scale advection, keeping outcomes sensitive to small shifts in timing of precipitation or urban heat-island amplification. Updated guidance from regional agencies over the next 48 hours will likely resolve the narrow spread between the two leading bins.