Forecasts from the National Weather Service and other models indicate Atlanta’s minimum temperature on September 21 will likely fall in the low 70s °F under a warm, humid airmass with light winds and limited overnight radiative cooling. High dew points near 70 °F and a slight chance of evening thunderstorms further suppress cooling, keeping the low well above the 1991–2020 average of 64 °F. The near-even market split between 65 °F or below and 84 °F or higher reflects residual uncertainty in short-range model guidance and the possibility of localized variations or measurement timing at official stations, while mid-range buckets capture the most probable outcomes around 70–72 °F. A stronger cold front is not expected until mid-week, leaving the 21st in the current warm regime.