Incoming cold air advection from the north, combined with widespread precipitation, is driving trader positioning on Wuhan's September 17 minimum temperature. Official forecasts and ensemble guidance indicate a sharp cooldown, with models showing daily lows clustered near 18–20 °C amid northeasterly flow, high humidity, and 5–25 mm of rain that limits nighttime radiational cooling while enhancing evaporative effects. This setup creates a relatively narrow but uncertain range: stronger or earlier frontal passage could push minima toward 17 °C or below, whereas delayed rain or partial clearing might hold values near 21–22 °C. The near-even split between the 24 °C+ and 14 °C– buckets reflects model spread in timing and intensity of the cool surge, typical for transitional autumn systems where small shifts in steering flow alter the minimum by several degrees. Updated short-range guidance expected overnight will likely tighten consensus ahead of resolution.