Recent forecasts from major models indicate Shanghai's minimum temperature on August 21 will likely hover near 26–27°C, driven by persistent cloud cover, scattered thunderstorms, and elevated humidity that limit nocturnal radiative cooling. These conditions, typical of late-summer East Asian monsoon patterns, reduce the temperature drop after daytime highs near 32°C, while light easterly winds offer minimal advection of cooler air. The narrow spread between the leading market outcomes reflects model consensus on baseline humidity and precipitation but leaves room for uncertainty in exact cloud timing and urban heat-island effects, which can add 1–2°C locally. Updated runs from agencies like the China Meteorological Administration will refine these variables ahead of resolution.