**Persistent cloud cover, scattered showers, and elevated humidity are moderating daytime heating in Zhengzhou ahead of August 24.** Multiple numerical weather models and official guidance converge on a maximum near 30–31 °C, with an 80–100 % probability of rain or thunderstorms that will reduce incoming solar radiation and cap the peak. Dew points near 25–27 °C and light northeasterly flow further limit surface warming by maintaining high boundary-layer moisture. Recent synoptic evolution shows the subtropical high shifting and low-level troughs increasing convective activity across the North China Plain, consistent with the pattern that kept highs at or below 33 °C through late August. Ensemble spread and timing differences in precipitation explain why markets price 31 °C and 32 °C or higher as nearly equal favorites: a few hours of earlier clearing could push readings to 32 °C, while prolonged rain would hold the maximum closer to 30 °C. Official verification will come from the Zhengzhou meteorological station’s daily maximum.