Recent National Weather Service and ensemble forecasts indicate Chicago's minimum temperature on October 3 will likely fall in the low-to-mid 50s°F, driven by post-frontal clearing, northeast winds of 5–10 mph, and dry air under mostly sunny skies that permit moderate radiational cooling overnight. This aligns with climatological normals near 51°F for early October while limiting potential for either sub-40°F readings or highs pushing the daily low above 58°F. Model consensus shows low spread in boundary-layer conditions, though small shifts in cloud cover or wind speed could nudge the exact minimum across adjacent two-degree bins. Updated runs from NOAA and local offices will refine the precise overnight low before resolution.