Recent forecasts for Shanghai point to a minimum temperature on September 1 clustered around 24–26°C, with local models and ensemble guidance showing modest overnight cooling under increasing cloud cover and scattered rain. This range aligns with the tight market clustering, where 26°C leads at 34% implied probability amid comparable shares for adjacent values. Primary drivers include the influence of a passing trough or frontal boundary that enhances moisture and reduces clear-sky radiative cooling, while light winds limit mixing. Historical climatology for early September shows typical lows near 24°C, but current conditions—warm, humid air masses from the northwest Pacific—introduce variability depending on exact precipitation timing and cloud thickness. Traders appear to weigh model consensus from sources like the China Meteorological Administration and global ensembles, which diverge slightly on whether enhanced cloud cover or brief clearing will allow a dip toward 23°C or hold closer to 27°C. With resolution imminent, any updated short-range runs highlighting changes in boundary-layer moisture or wind could quickly shift the distribution.