Current forecasts for Zhengzhou on September 20 show a daily minimum near 20–22°C under overcast skies, light northerly winds, and widespread light rain or showers, with high humidity near 80–90% limiting radiative cooling overnight. Cloud cover and precipitation moderate temperatures by trapping longwave radiation and reducing diurnal range, while a modest cool-air advection from the north prevents stronger warming. Model consensus from GFS and similar runs places the low in the low-20s°C range, though small shifts in timing of rain or wind could alter the exact minimum by 1–2°C. This setup creates tight clustering around mid-range outcomes, with extremes requiring either unseasonably strong cooling or unexpected clearing and southerly flow. Updated model runs and official China Meteorological Administration guidance through the evening of September 19 will refine the final reading.