Trader consensus on Polymarket strongly favors 18°C as Shanghai's lowest temperature on June 10, reflecting stable high-pressure conditions and consistent observational data from regional meteorological networks showing minimum readings locked in that range. Current model guidance indicates limited diurnal variation, with overnight lows held near this threshold by moderate humidity and light winds, consistent with typical early June climatology for the Yangtze River Delta. This positioning aligns with the resolution criteria based on official station measurements. Scenarios that could alter the outcome remain narrow, such as an unforecasted cold front or localized urban heat island effects shifting the recorded minimum by 1–2°C, though updated model runs through the evening window show low probability of such shifts.