The market's tight clustering of implied probabilities between 31°C and 33°C for Chengdu's August 16 maximum temperature reflects lingering uncertainty in short-range numerical weather prediction models amid a transitional summer synoptic pattern. Recent ensemble runs show modest spread in the positioning of the western Pacific subtropical high, which controls clear-sky insolation and daytime heating over the Sichuan Basin; slight eastward shifts favor the lower end of the range while stronger ridging supports 33°C or above. Local factors including high humidity, urban heat-island effects, and potential afternoon convection add further variability, consistent with historical August variability where daily maxima commonly fluctuate 2–4°C around the 30–32°C climatological baseline. Updated CMA and ECMWF model guidance expected in the next 24–48 hours will likely narrow the distribution ahead of market resolution.