Recent forecasts from major models and agencies indicate Shanghai's overnight minimum on August 17 will likely settle between 25–26°C under cloudy skies and moderate humidity, producing the tight market split between those two outcomes. Persistent summer moisture and limited radiative cooling overnight, combined with any residual showers or variable wind, create small but meaningful differences in how much temperatures drop before dawn. Historical August climatology shows average lows near 25°C, yet short-term model runs still diverge slightly on exact timing of cloud breaks or localized effects, keeping the implied probabilities closely matched. Newer guidance from the China Meteorological Administration or updated global ensembles over the next 24–48 hours will likely resolve the narrow gap between 25°C and 26°C.