**Trader consensus at 100% implied probability for a 30°C high in Shanghai on September 6 reflects broad agreement across official forecasts and observational data pointing to that exact threshold.** Multiple meteorological sources, including regional models and China Meteorological Administration-aligned outlooks, project daytime maxima near 30°C under partly cloudy to clearing skies with light northerly winds and moderate humidity. Current conditions show afternoon readings climbing into the upper 20s°C, consistent with seasonal norms for early September when mean highs typically range 27–29°C. Resolution hinges on the official daily maximum recorded at designated stations, leaving limited room for deviation unless localized convective activity or measurement timing produces a final value outside the narrow band.