Official National Weather Service forecasts and observations for Atlanta on September 13, 2026, centered on a high near 90°F under mostly sunny skies with light northwest winds, aligning with model consensus and producing the market's 100% implied probability for the 90-91°F bin. Post-event data from primary stations, including Hartsfield-Jackson, recorded a daily maximum in this narrow range, consistent with regional high-pressure ridging and above-average September warmth but below historical extremes for the date. Trader consensus reflects the low uncertainty in verified surface observations once the period closed. A realistic challenge would require an official data revision or use of an alternate station reporting outside this threshold, though such adjustments are uncommon for this resolution source.