Latest China Meteorological Administration and global ensemble forecasts point to a daytime high in Guangzhou on August 13 between 35–37 °C, with light rain or patchy showers expected to limit full solar heating and create the tight clustering around those bins. Subtropical moisture from the South China Sea, combined with urban heat-island effects in the Pearl River Delta, keeps baseline temperatures elevated, while variable cloud cover and timing of any convective cells introduce the main uncertainty differentiating the 35 °C, 36 °C, and 37 °C outcomes. Historical August climatology shows typical maxima near 33–34 °C, so current guidance reflects a modest positive anomaly. Traders will watch the next CMA and ECMWF model runs plus local observational updates through August 12 for any shifts in precipitation timing or intensity that could alter the peak.