Current forecasts from the National Weather Service and other models show Chicago overnight lows on August 24 near 60–64 °F under mostly clear skies and light northwest-to-southwest winds. These conditions promote radiational cooling after daytime highs in the mid-70s, though Lake Michigan’s moderating influence and any late-evening cloud increase could limit the drop. The market’s tight clustering around 56–59 °F reflects uncertainty in exact minimum timing, wind speed, or dew-point depression at the official station, while the notable share on 47 °F or below accounts for the low-probability tail of cooler model solutions or unseasonal cold-air advection. Updated model runs and evening observations will refine these narrow temperature bands ahead of resolution.