Traders see 27–29°C as the most likely range for Chengdu’s August 19 high because short-range model guidance shows only modest day-to-day variability under lingering subtropical high pressure. Recent runs from global ensembles indicate daytime maxima near 28–29°C, with scattered showers or increased cloud cover potentially capping temperatures at 27°C while clearer breaks could allow brief peaks near 29°C. The Sichuan Basin’s high humidity and urban heat island effect narrow the diurnal range, and official forecasts from the China Meteorological Administration align with this tight cluster rather than extremes. Historical mid-August climatology supports averages around 29°C, yet the current slight model spread on precipitation timing keeps the two leading outcomes nearly tied in implied probability.