Traders see the highest temperature in Chengdu on May 18 clustering tightly between 29°C and 33°C because current model runs place the city under transitional late-spring conditions typical for the Sichuan basin. Ensemble guidance shows modest daytime heating from southerly flow ahead of the East Asian monsoon, with surface temperatures expected to peak near the long-term May average of 28–30°C. Minor differences in how models handle low-level humidity and incoming shortwave radiation create the narrow spread across these outcomes, while the low probabilities for extremes reflect the absence of strong high-pressure ridging or cold-air intrusions that would push readings outside this range. Fresh updates from the China Meteorological Administration over the next 48 hours will likely tighten the forecast as the event window approaches.