Recent forecasts from numerical weather models and agencies including the China Meteorological Administration indicate daytime maxima in Shanghai on August 15 will likely reach 29–31°C under persistent cloud cover, scattered thunderstorms, and high humidity near 80%. These conditions limit surface heating by reducing incoming solar radiation and enhancing evaporative cooling from rainfall, keeping peaks below the seasonal August average of roughly 32°C. The closely matched market probabilities around 29–30°C reflect genuine uncertainty in the precise timing and coverage of convective activity, which can suppress or allow brief warming depending on steering winds and moisture convergence. Updated model runs over the next 48 hours will clarify whether stronger instability pushes the high toward 31°C or maintains the current cooler bias.