**Mild southerly flow and persistent cloud cover are anchoring trader expectations for Shanghai's October 16 minimum near 20–21 °C.** Official and ensemble guidance, including GFS and regional models, indicate overnight lows of 20–22 °C under mostly cloudy skies with light southeasterly winds and possible drizzle, limiting radiative cooling. This aligns with current surface observations of 21–22 °C and dew points near 15–16 °C. Historical mid-October averages are lower (around 15–18 °C), but the absence of a strong cold front or clear-sky conditions supports the market's heavy weighting toward 20 °C (37 %) and 21 °C (47.5 %). Updated model runs and early-morning observations on October 16 will provide the final verification data for resolution.