**Current NWS guidance and short-range models point to an overnight low in the low-to-mid 60s°F for Chicago on August 24, 2026, consistent with late-summer normals near 64°F.** Trader sentiment reflects tight clustering around the 56–59°F outcomes because small differences in forecast details—such as the timing of any weak frontal passage, cloud cover that limits radiative cooling, or boundary-layer wind speeds—can shift the minimum by a few degrees. Clear, calm nights enhance surface heat loss through longwave radiation, while even light northerly flow or increased mixing keeps temperatures higher; lake-breeze effects from Lake Michigan can further moderate readings at official stations like O’Hare. Recent clearing after earlier showers has favored stronger nocturnal cooling, but model spread on exact dew-point recovery and any residual moisture keeps probabilities distributed across the mid-50s to upper-50s bins. Historical August variability shows occasional cooler nights when high pressure builds with light winds, yet persistent warm advection usually prevents drops below the mid-50s. With resolution hinging on the single lowest hourly observation, traders weigh the latest model runs and NWS updates for any shift in these variables before the 24-hour period closes.