Short-term numerical weather prediction models indicate high uncertainty for Chengdu's August 5 maximum temperature, with ensemble spreads reflecting variable subtropical high influence, afternoon convection, and cloud cover that can suppress or enhance surface heating. Historical August climatology centers on 30–34°C highs amid humid subtropical conditions, where dew points near 25°C amplify apparent temperatures via reduced evaporative cooling. Recent model runs show potential for 33–35°C under clearer skies versus 30–32°C with scattered showers or thicker stratus, creating tight market probabilities around those bins. Urban heat island effects from the basin topography further differentiate outcomes, while official China Meteorological Administration guidance and ECMWF/GFS updates over the next 48 hours will likely refine resolution criteria for this single-day measurement.