Recent National Weather Service and ensemble model guidance point to southerly flow and mostly sunny conditions lifting Chicago's October 6 high into the upper 60s to near 70°F, above the 1991–2020 climatological average of 67.6°F. This setup, with southwest winds gusting to 25 mph, favors the market's leading 72–75°F bin by supporting modest daytime warming while limiting cloud cover and precipitation. Traders appear to weigh the potential for slight upward forecast revisions or station-specific readings at O'Hare or Midway against the risk of cooler boundary-layer mixing. The next high-resolution model runs and 48-hour updates from NOAA will likely refine these implied probabilities before resolution.