Trader sentiment for Guangzhou's June 15 maximum temperature clusters tightly around 29–30°C because official short-range forecasts and ensemble models from regional meteorological agencies indicate highs near the June climatological average of 31°C, tempered by expected afternoon thundery showers and variable cloud cover that limit extreme peaks. High humidity and southeasterly monsoon flow sustain elevated baseline warmth, yet timing of convective rainfall—often peaking midday—introduces narrow uncertainty bands where a few hours' difference in precipitation onset can shift the daily maximum by 1–2°C. Historical analogs show June maxima rarely exceed 33°C without clear-sky conditions, supporting the modest probabilities assigned to 32°C or higher while leaving room for minor model revisions before resolution.