Official National Weather Service observations at Austin Bergstrom International Airport recorded a maximum of 89°F on October 5, 2026, at 3:57 PM CDT under clear skies and northerly flow. This value aligns precisely with the 88-89°F market outcome that reached 100% implied probability. The reading exceeded the 1991-2020 daily normal of 86°F by 3°F amid drier air advection following earlier moisture, with afternoon relative humidity dropping to 41% and supporting efficient daytime heating. Historical context shows October 5 highs averaging 85.9°F, with records near 96°F in prior years. Minor resolution risk remains only if station-specific criteria or post-analysis revisions alter the certified maximum, though NWS data provide the definitive benchmark for this temperature bin.