Recent National Weather Service and AccuWeather forecasts for Chicago O’Hare project an overnight low in the low-to-mid 60s °F under mostly clear skies after daytime highs near 76–82 °F. This places the 60–61 °F bin at the center of model consensus, with modest radiative cooling expected under light winds and typical late-August humidity. Historical normals for August 23 hover near 64 °F, so current guidance sits slightly below average yet well above the sub-55 °F thresholds that would require an atypical cold surge or stronger high-pressure setup. Updated model runs overnight have shown little deviation, keeping higher bins (62 °F+) at negligible implied odds while the 51 °F-or-below outcome reflects residual uncertainty in boundary-layer mixing rather than active cold-air advection. The next NWS forecast discussion and any revised temperature grids will be the primary near-term drivers for further market movement before resolution.