Chongqing’s late-August subtropical monsoon conditions, marked by high humidity, weak pressure gradients, and urban heat-island amplification, set the stage for daily maxima near the historical 34–35 °C average. Two-day-ahead guidance from the China Meteorological Administration and global ensembles shows modest ridging that could allow 37–38 °C peaks if skies remain mostly clear, while scattered afternoon convection or slightly stronger southerly flow would cap readings at 35–36 °C. The tight 28 %–27 % split between the 37 °C and 38 °C contracts reflects this narrow forecast spread and the sensitivity of maximum temperature to even small changes in cloud timing or boundary-layer moisture. Updated model runs issued over the next 24 hours will likely tighten or shift the distribution ahead of market resolution.