Recent forecasts indicate a cold air mass advancing southward across eastern China, moderating lingering summer heat in the Pearl River Delta and driving the tight clustering of market-implied odds around 31–33 °C for Guangzhou’s October 2 maximum. Official guidance shows daytime highs near 32–34 °C on September 30 before widespread rain and thunderstorms associated with the frontal boundary reduce insolation and lower the peak by 1–3 °C on the 2nd. Ensemble model spreads reflect uncertainty in exact cloud cover, rainfall timing, and boundary-layer moisture, which can shift the daily maximum across the narrow 31–33 °C window. Historical early-October averages of 30–31 °C provide context, yet the current synoptic transition keeps probabilities evenly distributed among the top three outcomes.