**Persistent heavy rain and thick cloud cover are suppressing daytime heating in Zhengzhou, keeping the August 13 maximum temperature tightly clustered around 24–26 °C according to the latest model guidance.** Official forecasts from sources such as timeanddate.com and BBC Weather project a high of 24–24.4 °C under overcast skies and passing showers, with northerly winds advecting slightly cooler, moist air. This follows several days of above-average rainfall that has already lowered surface temperatures and increased soil moisture, reducing sensible heat flux. The narrow spread between the leading market outcomes (25 °C at 46.5 % and 26 °C at 43 %) reflects genuine uncertainty in the precise timing and intensity of any brief cloud breaks or the exact peak of insolation before renewed showers develop. Small differences in numerical weather prediction runs—particularly regarding boundary-layer mixing, rainfall rates, and the strength of the northeasterly flow—can shift the daily maximum by 1–2 °C. Historical August maxima average near 30 °C, but the current synoptic pattern deviates markedly from climatology due to the ongoing wet regime. Traders are therefore pricing the outcome near the lower end of the typical summer range while assigning meaningful probability mass to both 25 °C and 26 °C, consistent with the limited upside potential under continued overcast, rainy conditions. New model runs and observational updates through the evening of August 12 will be the key catalysts for any further market movement before resolution.