Recent forecasts from sources including the China Meteorological Administration and global models indicate Beijing's overnight low on September 18 will likely settle near 19–20°C amid partly cloudy skies, light southerly winds, and moderate humidity. These conditions limit strong radiative cooling compared to clearer nights, while the urban heat island effect and residual warmth from a daytime high near 28–29°C support the higher end of the range. Model consensus shows minor divergence on exact timing of any cloud increases or wind shifts, which can alter the minimum by 1–2°C through changes in boundary-layer mixing. Historical September baselines for the city feature average lows around 16–18°C, making current readings notably milder and aligning with market-implied odds clustering tightly around 18–20°C. Updated observations through the evening will refine the final recorded minimum.