Official meteorological observations and forecast models from agencies like the China Meteorological Administration indicate Beijing's October 1 high will reach exactly 23°C, driving the market's near-certain consensus. Autumnal conditions with moderate high pressure, typical seasonal cooling from September averages around 25–27°C, and minimal diurnal variability support this precise outcome. Traders weigh real-time station data against ensemble predictions showing tight clustering around 23°C, with low uncertainty in the final recorded maximum. An unexpected urban heat island spike or measurement timing shift at official sites could still alter resolution if final verified readings deviate.