Persistent warm and humid conditions driven by the subtropical high and monsoon moisture are keeping overnight lows elevated in Zhengzhou on August 21. Official forecasts from multiple sources indicate a minimum near 24–26 °C amid partly cloudy skies, scattered thunderstorms, and dew points around 24 °C that limit radiative cooling. No significant cold-air advection or frontal passage is expected today, consistent with trader emphasis on the 25 °C-or-higher outcome at 59.5 % implied probability. Recent model runs and surface observations show only modest overnight drops, with humidity near 80–90 % sustaining warmth; resolution will hinge on the official Zhengzhou station minimum reported by China Meteorological Administration.