**Forecast models and official guidance for Shenzhen on August 29 indicate a likely daily maximum in the low-to-mid 30s°C, with probabilities clustered around 33–35°C reflecting uncertainty in precipitation timing and intensity.** Persistent monsoon moisture and embedded thunderstorms are expected to produce periods of heavy rain and cloud cover that limit surface heating, consistent with recent days of widespread showers across Guangdong. Subtropical humidity near 85–90% and light winds further moderate peak temperatures by reducing solar insolation during convective outbreaks. Sources show slight divergence—some runs favor 33°C under sustained rain while others allow brief clearing for 35°C—creating the close market spread. Updated model runs and local observations in the next 24–48 hours will refine these thresholds ahead of resolution.