**Trader sentiment for Shanghai’s August 8 minimum temperature centers on 28–29°C as the most probable outcomes (combined ~75% market-implied probability), with forecasts from multiple models converging on an overnight low in that narrow band.** Recent conditions feature a strong subtropical high-pressure ridge maintaining elevated dew points and limited radiative cooling overnight, typical for mid-August in the Yangtze River Delta. Scattered thunderstorms or overcast skies expected late on the 7th or during the 8th further reduce the diurnal temperature range by trapping heat and moisture, keeping minimums from dropping to the seasonal average of ~25–26°C. Official guidance and ensemble models (including those referenced in parallel Polymarket activity) show the overnight low hovering near 28°C, with small variations arising from exact wind speeds, cloud timing, and urban heat-island effects at Shanghai’s official observing sites. The tight 38%/37% split between 29°C and 28°C reflects genuine forecast uncertainty at the 1°C resolution level rather than a shift in the underlying pattern; traders weigh the latest model runs showing minor differences in boundary-layer moisture and any brief clearing that could allow slightly more cooling. Resolution will depend on the official minimum recorded at the Shanghai station, which integrates these meteorological variables under persistent summer humidity above 70%.