Forecast models from the National Weather Service and other sources indicate partly cloudy skies with northwest winds of 5-10 mph on October 8, supporting a daytime high in the upper 60s Fahrenheit for Chicago, near the 1991-2020 climatological average of 66.8°F. Recent cooler air advection following October 7's upper-70s warmth has stabilized temperatures, with limited mixing and modest insolation preventing stronger warming. The close contest between 68-69°F and 70-71°F outcomes reflects minor uncertainties in cloud timing and boundary-layer details across ensemble runs, where slightly reduced cover or lighter winds could add 1-2°F. Updated NWS guidance and morning observations will refine these ranges ahead of market resolution.