Recent National Weather Service and model consensus forecasts for Chicago indicate a minimum temperature near 51–53°F on October 3 under mostly clear skies following a cold frontal passage. Easterly winds of 5–10 mph and building high pressure favor moderate radiational cooling overnight after daytime highs in the low-to-mid 60s, consistent with the early-October climatological average low of 51°F. Clear conditions enhance surface heat loss but limit further drops given the season’s solar angles and lack of snow cover or strong advection. The closely matched market-implied odds for sub-40°F or 58°F-plus outcomes reflect trader weighting of residual model spread and potential steering-pattern shifts, while narrower bins around 50–55°F capture the current central tendency from ensemble guidance. Updated model runs and evening observations on October 2 will refine the precise minimum before resolution.