Recent National Weather Service forecasts and ensemble model guidance indicate a high near 77–79°F for Chicago on August 22 under northwest winds of 10–15 mph and decreasing cloud cover after morning hours, supporting the market’s heaviest weighting on the 78–81°F range. This reflects a cooler air mass following Friday’s activity, with limited moisture and no strong warm advection expected to push readings above the seasonal average of 82°F. Minor model spread around boundary-layer mixing and exact cloud timing keeps 82–83°F as a plausible upside outcome at lower probability, while downside risk below 76°F appears limited by current observations and climatology. Updated NWS briefings and 6–12 hour model runs ahead of sunrise on the 22nd will provide the final inputs for resolution.