Official National Weather Service and NOAA forecasts for Chicago on October 15, 2026, indicate a daytime high in the low-to-mid 60s°F under persistent cloud cover, scattered showers, and southeasterly flow that limits daytime heating. Hourly model guidance shows temperatures climbing from the upper 50s overnight into the low-to-mid 60s by afternoon, with peaks near 64–66°F before cooling. These conditions align closely with the market’s leading bins at 64–65°F (39%) and 66–67°F (27%), reflecting trader consensus around the NWS point forecast of 64°F and historical mid-October normals near 63°F. Light rain and high humidity further suppress maximum temperatures, while the absence of strong warm advection or clearing skies keeps higher outcomes like 68°F+ at low implied probabilities. Updated model runs and evening observations will refine exact resolution.