**Forecast models from the National Weather Service and other sources indicate a high near 88–90°F for Atlanta on August 29, 2026, under a typical late-summer regime of partly sunny skies, light easterly flow, and afternoon convection.** Afternoon thunderstorms, with 20–40% probability, introduce the main uncertainty: earlier or more widespread storms increase cloud cover and evaporative cooling, favoring a peak in the mid-to-upper 80s, while delayed or isolated activity allows temperatures to edge toward 90°F. Dew points in the low 70s sustain high humidity and heat indices near or above 90°F, but steering patterns and boundary-layer mixing keep the daily maximum from climbing much higher. Market-implied odds cluster tightly around 84–89°F because ensemble guidance shows modest spread in storm timing and coverage, with limited potential for either a cooler, rainier day or a significantly hotter one absent a major pattern shift. Official observations from prior days show highs near 90°F amid similar conditions, reinforcing trader focus on how convective evolution modulates the outcome.