Recent forecasts from models like those used by the China Meteorological Administration point to a maximum temperature near 31°C in Shanghai on August 21, with trader consensus split closely between 30–32°C reflecting model spread on convective timing. Persistent subtropical high pressure combined with residual moisture from the East Asian summer monsoon favors afternoon thundershowers that could cap daytime heating through increased cloud cover and evaporative cooling, while urban heat island effects and light easterly winds may allow brief spikes if skies clear earlier. Historical August baselines average 31–32°C, but recent typhoon-induced flooding has enhanced boundary-layer humidity, increasing uncertainty in peak values by 1–2°C depending on exact precipitation onset. Updated NWP runs and local observations in the next 48 hours will likely narrow this range before resolution.