Recent ensemble forecasts from agencies including the China Meteorological Administration and international models indicate a September 1 high near 29°C in Beijing under mostly sunny to partly cloudy skies with light northeast winds, driving the near-even market split between 29°C and 30°C. This reflects typical early-autumn transition from summer peaks, consistent with the 1991–2020 climatological average high of 28.9°C for the date. Minor differences among model runs on cloud cover, boundary-layer mixing, and urban heat effects create the tight clustering around 28–30°C, while lower-probability outcomes above 31°C or below 28°C would require unexpected shifts in steering patterns or greater daytime heating. Updated model runs and official briefings in the final 48 hours will likely narrow remaining uncertainty before resolution.