Recent forecast runs from the China Meteorological Administration and ECMWF ensembles indicate persistent cloud cover with scattered showers across the Pearl River Delta, which are suppressing daytime heating and anchoring Shenzhen’s maximum temperature at 27°C on May 17. This aligns with mid-May climatological norms for the region, where typical highs range 28–30°C but elevated humidity and reduced insolation have kept readings closer to the lower end of that band. Official surface observations through the morning confirm the trend, with traders rapidly pricing near-certainty in the 27°C bin as resolution draws near. A brief window of clearing or lighter winds later today remains the only realistic pathway for a 1°C deviation, though current model agreement makes such an outcome unlikely.