Recent ensemble forecasts from global models indicate Shanghai's August 21 maximum temperature will most likely fall in the 30–32°C range, with 31°C carrying the highest implied probability due to typical late-summer diurnal heating under partly cloudy skies and moderate humidity levels near 75–85%. Persistent East Asian monsoon moisture and scattered convective showers or thunderstorms—common in the region during peak season—could cap daytime peaks by limiting solar insolation, while any clearer intervals or southeasterly flow might allow brief warming toward 32°C. Historical August averages hover near 31–32°C, but short-term variability from cloud cover and precipitation timing keeps outcomes closely matched among leading bins. Updated model runs and official China Meteorological Administration guidance over the next 48 hours will provide the key data points for resolution.