Recent forecast model runs from the China Meteorological Administration and international agencies show high uncertainty in Beijing's overnight minimum on September 27, with some projecting northerly winds and clearing skies after scattered rain to deliver lows near or below 13°C, while others indicate lingering southerly flow and cloud cover holding readings at 17–18°C or higher. This stems from variable timing of a weak cold front amid recent above-average warmth, where small shifts in wind direction or precipitation timing can alter radiative cooling rates by several degrees. Historical late-September averages near 13–14°C provide context, but current ensemble spreads keep the 13°C-or-below and warmer scenarios nearly tied in market-implied odds. Updated model guidance and official CMA briefings expected within 48 hours will likely refine the range.