**Consensus forecasts from global and regional models indicate Shanghai's overnight low on October 15 will likely fall between 17–19°C under mostly cloudy skies and light southeast winds, driving the market's heavy weighting toward 16°C (43%) and 17°C (25%) as leading outcomes.** Mild autumn conditions with no strong cold-air advection or frontal passage allow only modest radiational cooling after a daytime high near 24–25°C. Multiple sources, including GFS-derived guidance and Chinese meteorological outlooks, converge on this range, though slight variations in cloud thickness or wind speed introduce uncertainty that keeps 15°C and 18°C+ outcomes viable at lower probabilities. The market-implied odds reflect traders' assessment of this narrow forecast envelope ahead of final observational data.