Persistent monsoon moisture and widespread thunderstorms across southern China are anchoring overnight lows in Shenzhen near 28°C for August 23, with numerical weather prediction models from major agencies showing minima clustered tightly between 27–29°C amid 80–90% relative humidity and light southerly winds. This setup limits nocturnal radiative cooling and boundary-layer mixing typical of subtropical summer nights, producing the strong market consensus at 90.3% implied probability for 28°C. Minor model spread in the timing of heaviest rain or brief clear spells could realistically allow the minimum to reach 27°C or, less likely, dip toward 26°C before resolution.