**Trader sentiment for Zhengzhou’s August 21 daily minimum temperature reflects closely matched forecasts centered on 23–26 °C.** Multiple models indicate a likely low near 23–25 °C, driven by a warm, humid summer air mass with high dew points, light northeasterly winds, and frequent cloud cover or showers that limit overnight radiative cooling. Persistent humidity (often 70–85 %) and scattered precipitation reduce temperature drops compared with drier conditions. Minor differences in model timing of cloud breaks or rain intensity create the near-even odds between 24 °C and 25 °C or higher, while probabilities fall sharply below 22 °C given the current thermal environment. Updated observations through the night will clarify whether the minimum settles at or above 24 °C.