Official forecasts from the National Weather Service and recent model guidance indicate a high near 82°F for Chicago on August 29 under partly to mostly cloudy skies with southerly flow. This consensus, centered on low-80s readings, aligns closely with the tightly bunched market odds around 78–83°F. Key differentiating factors include modest model spread on the timing and extent of cloud cover, which modulates surface heating, alongside variable boundary-layer moisture and weak southerly advection from the Gulf. Lake Michigan’s moderating influence and any late-day convective development could cap the peak by a degree or two, while clearer intervals or stronger winds might allow brief excursions into the mid-80s. Updated model runs and afternoon observations will refine these thresholds ahead of market resolution.