Recent cold front passage and associated cooler marine air have driven Seattle's overnight lows into the mid-40s, aligning with seasonal October averages near 48°F while creating tight market spreads around 44–49°F. Clearer skies and light winds overnight promote radiative cooling that could push readings into the upper 30s in sheltered areas, supporting the near-even odds on sub-40°F outcomes, whereas lingering clouds or renewed onshore flow would hold minima closer to 50°F. NOAA model consensus and local observations show modest spread in minimum temperature forecasts, with traders weighing historical analogs of post-frontal cooling against current pressure gradients and dew point trends for resolution.