**Recent National Weather Service guidance and ensemble model runs point to a high in the low-to-mid 60s°F for Chicago on October 3 under clearing skies and northeast flow behind Thursday’s cold front.** After heavy rain and a sharp temperature drop on October 1–2, high pressure builds with light easterly winds, limiting daytime warming while allowing abundant sunshine. This setup favors readings near the historical average of 69°F only if mixing is stronger than currently modeled; most deterministic and ensemble solutions instead cluster in the 62–67°F range. The close market split between the 66–67°F and 68–69°F bins reflects residual uncertainty in the exact peak, driven by small differences in boundary-layer mixing and the precise timing of full clearing. New model cycles and NWS updates through October 2 will be the next key inputs for traders.