Current forecast models from the China Meteorological Administration and global ensembles like ECMWF project a peak temperature near 30–31°C for Guangzhou on May 19 amid typical early-summer subtropical conditions, with daytime heating supported by southerly flow and limited cloud cover. Historical May climatology shows average highs of 29–31°C, and recent observational trends indicate no strong cooling influence from northern fronts or heavy precipitation that might cap the maximum. Market-implied odds cluster around 28–31°C because small differences in timing of any patchy rain or afternoon convection—key variables in Pearl River Delta heat buildup—can shift the exact daily high by 1–2°C. Updated model runs and CMA briefings over the next 48 hours will refine these probabilities as land-sea breeze patterns and humidity levels evolve.