Forecast models from the China Meteorological Administration and international sources project Zhengzhou’s August 21 high near 30–32°C under late-summer East Asian monsoon influence, with elevated humidity, scattered showers, and variable cloud cover creating narrow uncertainty around peak readings. Thunderstorm timing can suppress afternoon maxima by limiting solar heating or allow brief clears that push temperatures higher, differentiating the closely matched market-implied odds near 31–32°C. These conditions align with historical August baselines of 30–33°C, where urban heat effects in the city amplify daily peaks relative to surrounding rural stations. Updated model runs and official briefings over the next several hours will refine the exact threshold most likely to resolve the contracts.