Recent National Weather Service and model guidance indicate clear skies and light northwest winds over Atlanta through September 27, favoring strong radiational cooling after sunset and supporting an overnight low in the mid-50s. This setup aligns with climatological norms for late-September high-pressure regimes, when reduced humidity and minimal cloud cover enhance surface heat loss. Forecast spread across GFS and other runs creates the tight market balance between sub-50 °F and 68 °F+ outcomes, as modest shifts in wind speed, dewpoint, or arrival timing of drier air could alter minimums by several degrees. Updated model runs and evening observations on the 26th will be the key near-term catalysts.