Forecast models from agencies including the ECMWF and GFS indicate Shanghai’s minimum temperature on September 16 will likely fall between 21–23°C under northeast flow and mostly clear to partly cloudy skies, consistent with the September climatological baseline of 20–22°C lows. Recent observations show stable conditions with daytime maxima near 28–29°C and no strong cold advection or frontal passage expected in the next 48 hours. Trader-implied odds near 50% for 17°C or below versus 44% for 27°C or higher reflect model spread in nocturnal cooling rates and boundary-layer humidity, while the tight clustering around 21–23°C outcomes captures the narrow uncertainty range in official guidance. Updated model runs and local observations over the coming day will likely tighten these probabilities.