Official observations from the National Weather Service at Austin-Bergstrom International Airport recorded a daily maximum of 98°F on September 24, 2026, driven by a stagnant warm air mass with light easterly winds and minimal cloud cover that allowed strong solar heating above the seasonal normal of 89°F. Pre-event forecast models from the GFS and local guidance consistently projected afternoon highs in the mid- to upper 90s, with heat indices near 101–104°F, aligning trader consensus on the 96–97°F bin at near-certainty. This positioning reflects verified surface data and climatological context of an unusually warm September rather than model projections alone. A shift in final station readings or alternative measurement sources could have altered resolution, though official NWS values provided the authoritative benchmark for market settlement.