Current National Weather Service and model guidance for Chicago on July 30 indicate a near-normal late-July pattern, with surface high pressure and light winds supporting daytime highs centered in the mid-80s. Consensus forecasts emphasize modest warming under partly sunny skies, tempered by typical urban heat-island effects and any residual moisture from upstream systems, keeping most outcomes between 84–89 °F. Key variables include the precise timing and strength of any weak frontal boundary, which could increase cloud cover and cap temperatures near 82–83 °F, versus clearer conditions allowing brief excursions to 88–91 °F. Historical climatology shows late-July highs averaging ~84 °F at O’Hare, providing context for why traders assign the highest implied probabilities to the 84–87 °F bins while leaving room for model spread. Updated NWS discussions and 12z model runs tomorrow morning represent the next decision points likely to influence market resolution.