**Forecast models from the National Weather Service and other sources point to an overnight low in the low 70s for Atlanta on August 21, 2026, consistent with the market's tightly bunched probabilities around 72–77°F.** Atlanta has seen persistently warm conditions through mid-to-late August, with recent overnight lows mostly in the mid-70s amid high humidity and dew points near 70–72°F. These elevated moisture levels limit radiational cooling once skies clear after any afternoon or evening showers. Light winds and partial cloud cover expected overnight further moderate temperature drops, keeping the minimum from falling much below the mid-70s in most guidance while preventing it from staying in the upper 70s. The near-even split among the top three bins (72–73°F, 74–75°F, and 76–77°F) reflects genuine uncertainty in the precise hourly minimum, driven by variables such as exact cloud timing, any lingering thunderstorm activity, and local urban heat effects. Historical August lows in Atlanta average near 71°F, but the current warm pattern and forecast consensus have shifted trader focus to the low-to-mid 70s range. Updated model runs or real-time observations near dawn will likely determine the final resolution.