National Weather Service and private model guidance for Chicago on August 6 point to a high in the upper 70s amid increasing clouds, scattered thunderstorms, and a southwesterly flow that limits daytime heating. This setup follows several days of near- or below-normal readings, with lake moderation and moisture reducing solar insolation relative to typical early-August conditions when highs average near 83°F. Ensemble consensus shows little support for readings above 82°F, keeping market-implied probabilities concentrated on the 76–81°F range while assigning only marginal odds to warmer or cooler outliers. Updated model runs and the 6 a.m. NWS forecast discussion represent the next key inputs likely to refine these probabilities.