**Forecast consensus from the National Weather Service and multiple models places Austin’s high on August 28, 2026, in the upper 90s to low 100s°F, aligning with the market’s leading bins of 100-101°F (45%) and 98-99°F (28.5%).** Late-August Central Texas climatology features persistent subtropical high pressure, southerly flow advecting Gulf moisture, and strong solar heating, routinely producing daily maxima near 96–102°F. Current guidance shows a modest cooling trend from Thursday’s ~102°F peak, driven by increasing easterly winds, slightly higher afternoon cloud cover, and lower dewpoint mixing that limits peak insolation. Heat-index values are still expected to reach 109–110°F, but the dry-bulb maximum itself is the resolution criterion. Model agreement is high on this range, with only minor spread from local effects or timing of any weak boundary; precipitation chances remain low enough (<30%) not to suppress temperatures substantially. Updated NWS point forecasts and ensemble runs issued August 26–27 have stabilized around 98–100°F, giving traders high confidence in the 98–101°F window while leaving room for small upward revisions if skies clear more than expected.