**Cloud cover, light rain potential, and seasonal cooling in the Sichuan Basin are the main drivers keeping trader probabilities tightly clustered between 23–29°C for Chengdu’s October 3 high.** Official and model guidance from sources including WeatherBug, WindBorne, and Chinese meteorological outlets show daytime maxima most likely in the 23–26°C range under mostly cloudy to overcast skies with 30–50% rain chances, limiting solar heating and promoting modest evaporative cooling. Recent days have featured similar stable, moist conditions with highs near 23–25°C, consistent with early-October climatology where basin topography often sustains cloud decks and suppresses strong diurnal warming. Forecast spread arises from minor differences in shower timing and thickness of cloud layers, which can shift peak temperatures by 1–3°C; later model runs and updated guidance closer to the date will refine these variables and likely narrow the distribution.