**Current model consensus points to a minimum temperature near 25–26°C for Shanghai on September 1, 2026, consistent with the market’s leading outcomes at 26°C (50.5%) and 25°C (17.0%).** Short-range forecasts from multiple sources, including high-resolution guidance valid as of August 30, indicate an overnight low of approximately 25°C under mostly cloudy skies with scattered showers possible. This reflects typical early-September conditions influenced by the lingering influence of the western Pacific subtropical high, which maintains warm, humid air masses over the Yangtze River Delta while limiting strong radiational cooling. Urban heat retention and the moderating effect of the nearby East China Sea further support minimums in this narrow range rather than cooler values. Recent model runs show little day-to-day shift, with no incoming cold surge or clear-sky radiational cooling event expected before the market resolves. Probability mass clustered at 25–27°C therefore represents trader aggregation of these stable numerical weather prediction outputs, with the slight edge to 26°C reflecting the most frequent ensemble member solutions and historical analogs for similar synoptic setups. Updated model guidance and official observations from the China Meteorological Administration in the final 24–48 hours will be the primary near-term drivers of any movement in these implied probabilities.