Recent National Weather Service and model guidance point to a moderating air mass over Chicago on July 31, with afternoon highs most likely in the upper 70s to low 80s amid partial cloud cover and a chance of scattered showers that could cap peak temperatures. This setup follows earlier July warmth and aligns with current ensemble consensus showing modest cooling relative to the 84°F climatological normal. Key variables differentiating the closely matched 78–83°F outcomes include the precise timing and coverage of any convection, boundary-layer mixing depth, and local lake-breeze effects, all of which remain sensitive to the latest model runs. Updated NWS forecasts and real-time observations tomorrow will refine the final maximum.