Current numerical weather models from the Global Forecast System and European Centre for Medium-Range Weather Forecasts converge on a stable springtime pattern over eastern China that favors a nighttime low of 19–20 °C at Shanghai Pudong International Airport on May 18. Limited cold-air advection and moderate radiative cooling under clear to partly cloudy skies set the baseline, while boundary-layer moisture and light wind speeds remain the key variables that could nudge the minimum one degree higher or lower. Historical mid-May climatology shows overnight lows typically ranging 17–21 °C, placing the current market distribution squarely within expected seasonal norms. The next model update cycle within 24 hours will sharpen these inputs and likely tighten the spread among the leading outcomes.