Current forecast guidance from the China Meteorological Administration and international models centers on overnight lows of 20–21 °C for Shanghai on May 19, driven by sustained southerly flow from the South China Sea and moderate humidity that limits nocturnal radiative cooling. Slight differences in predicted cloud cover and wind speeds among GFS and ECMWF runs account for the tight clustering around 19–21 °C outcomes, as clearer conditions could enhance cooling by 1–2 °C while increased moisture would suppress it. Climatologically, mid-May minima at Pudong International Airport average 16–18 °C, so the current setup reflects a modest warm anomaly; traders will watch the next 48-hour model cycles for any shift in steering patterns or frontal passage that could alter the final minimum.