Traders assign the highest implied probability to a 31°C maximum in Zhengzhou on August 15 because short-range numerical weather prediction models consistently indicate a peak near this value under partly cloudy conditions with modest afternoon convective activity. Typical late-summer patterns in the North China Plain feature average highs around 30–31°C, and current guidance highlights potential scattered thunderstorms or increased cloud cover that would limit stronger insolation and cap temperatures below 32°C. Official regional forecasts reinforce this narrow range, with any brief clearing of skies as the main variable that could push readings slightly higher. Historical climatology shows low likelihood of extremes outside 28–33°C during mid-August, aligning with the market’s tight clustering around the leading outcome.