Recent observational data and short-range forecast models from agencies including the China Meteorological Administration indicate Shanghai reached a daily maximum of 28°C on September 12 under clear to partly cloudy conditions with light northeasterly winds. This aligns with surface station readings peaking in the late morning to early afternoon before gradual cooling, consistent with typical early-autumn climatology for the region. Trader consensus at near-certainty for 28°C reflects the narrow uncertainty range in verified measurements and the absence of significant model spread or unexpected atmospheric shifts. Only an official post-event revision from the designated reporting station or an undetected micro-scale heat anomaly could alter the outcome before resolution.