Recent National Weather Service forecasts and ensemble guidance point to an overnight low in the low-to-mid 60s for Chicago on October 13 as a warm, moist southwesterly flow yields to northwest winds and increasing cloud cover with showers after midnight. Model consensus shows limited radiational cooling under partly cloudy skies, with dew points near 60°F and light winds keeping minimums from dropping into the upper 50s while preventing readings above 68°F. The narrow spread among market-implied bins around 58–67°F reflects uncertainty in exact frontal timing and precipitation onset, which can alter the diurnal minimum by several degrees. Updated model runs and local observations through the evening will refine these thresholds ahead of resolution.