**Forecast models and official guidance position Atlanta's July 21 high near 91°F.** National Weather Service and private forecasts (AccuWeather, Weather.com, timeanddate) converge on 90–92°F under partly cloudy skies with a modest chance of afternoon thunderstorms. These conditions typically cap daytime maxima through reduced insolation and evaporative cooling. Atlanta’s subtropical July climate features average highs near 89°F, but recent days have trended slightly above normal amid humid, weakly sheared flow. Key variables traders monitor include cloud cover evolution, dewpoint trends (currently supporting heat indices above 95°F), and any late-day convective initiation that could shave 1–2°F off the peak. Model consensus shows limited spread, keeping 90–93°F bins dominant while assigning lower odds to extremes above 94°F or below 89°F. No major forecast shifts have occurred in the past 48 hours, supporting the market’s concentration around the 90–93°F range.