Recent ensemble forecasts for Shanghai on October 16 indicate a southeasterly flow advecting warmer maritime air, supporting daytime highs clustered around 25–27 °C under increasing cloud cover and light southeasterly winds of 10–15 km/h. Model consensus from sources such as GFS and ECMWF places the most probable peak between 26 °C and 27 °C, with minor spread arising from exact timing of cloud buildup and boundary-layer mixing that can shave or add 1 °C to the observed maximum. This narrow range explains the tight market split, as small revisions in the final model runs or local measurement differences at official stations could shift resolution between the leading outcomes. Updated guidance expected within the next 24 hours will further refine these probabilities ahead of market close.