**Trader consensus has converged on 100-101°F as the highest temperature recorded in Austin on September 10 because official observations from stations including Austin-Bergstrom International Airport confirmed a daily maximum in that narrow band under clear to partly cloudy skies and southerly flow.** Persistent high pressure and above-average dew points produced heat indices near 107°F, consistent with late-summer climatology where average highs reach 92°F but recent years have frequently seen 99–101°F peaks. Model guidance issued in the preceding 48 hours aligned closely with the eventual reading, leaving little room for revision. Only an unanticipated measurement error or station-specific anomaly could reopen the market, scenarios traders now assign negligible probability given multiple corroborating reports.