Traders are closely divided between 29–31°C for Shenzhen’s July 20 maximum because short-range models show scattered thunderstorms and persistent cloud cover that will limit solar heating in the city’s humid subtropical environment. Frequent afternoon convection typical of the East Asian monsoon season reduces insolation and promotes evaporative cooling, often capping daytime peaks 1–3°C below clear-sky climatology near 32°C. Key variables include the exact timing and coverage of showers, local sea-breeze strength, and urban heat retention; stronger or earlier storms favor the lower end of the range while partial clearing could allow 31–32°C. Official guidance from the China Meteorological Administration and global ensembles will refine these details over the next 48 hours, keeping implied probabilities tightly clustered around the most likely outcomes.