Latest short-range forecasts from the China Meteorological Administration and ensembles including ECMWF and GFS converge on a daytime peak of 28–29°C for Shenzhen on May 19, driven by a developing low-pressure trough that brings increased cloud cover and scattered afternoon showers across the Pearl River Delta. These conditions suppress peak solar heating relative to May’s typical 29–30°C climatological average, with light southerly winds and moderate humidity further moderating surface temperatures at the official Shenzhen Bao’an International Airport resolution station. Model spread on the exact timing and intensity of precipitation creates the narrow distribution of market-implied odds around 28–30°C, while historical analogs show that brief clearing could allow a 1°C overshoot before evening stabilization. Updated model runs and local observations over the next 48 hours will refine the final range.