Current numerical weather prediction models, including GFS and ECMWF runs, show Shanghai's overnight low on October 9 centered near 18–19°C under a stable high-pressure regime with light easterly flow and partly cloudy skies. Radiative cooling overnight will be moderated by residual daytime warmth, urban heat island effects, and relatively warm East China Sea surface temperatures near 24°C, limiting sharp drops. Minor model spread arises from differences in predicted cloud cover and boundary-layer mixing, which can shift the minimum by 1°C. Recent observations confirm mild conditions without incoming cold fronts, supporting the tight clustering of market-implied odds around these two outcomes. Official station readings at resolution time will determine the exact value.