Persistent cloud cover, widespread showers, and thunderstorms across Shanghai today are suppressing peak temperatures by limiting solar insolation and enhancing evaporative cooling, keeping the daily high tightly contested between 27–28 °C. Official guidance from sources including the China Meteorological Administration and international models shows morning readings near 26 °C rising modestly under humid subtropical conditions with light easterly winds and dew points around 24 °C, consistent with typical late-September patterns where rainfall often caps highs 2–4 °C below clear-sky potential. Trader consensus favoring 28 °C at 53.5 % reflects the narrow window for brief afternoon breaks in precipitation before cooling resumes, while 27 °C at 44 % accounts for sustained rain and model spread in maximum temperature forecasts. Final resolution hinges on official station observations through evening.