Traders have converged on 20°C as the implied maximum temperature in Chongqing for September 16 because official forecasts from the China Meteorological Administration and regional models show stable atmospheric conditions with daytime highs reaching exactly that threshold. September climatology for the city typically features highs near 28–32°C, yet a cooler air mass and increased cloud cover have suppressed readings, aligning observed data with the 20°C mark. This consensus reflects real-time surface observations and ensemble model agreement rather than projections. A late-afternoon spike from unexpected clearing or a measurement revision at the primary urban station could theoretically alter the outcome, though such shifts remain improbable given current stability.