National Weather Service forecasts and ensemble models from NOAA indicate Austin is likely to see a high near 95-97°F on September 29, driven by southerly flow ahead of a weak frontal boundary and above-average soil moisture limiting daytime heating. Recent model runs show limited spread, with most guidance keeping the peak below 100°F due to increasing cloud cover and modest easterly winds. Historical September climatology for central Texas places average highs around 90-92°F, supporting the market's concentration in the mid-90s range while leaving room for slight upward revisions if subsidence strengthens. Updated NWS briefings and new model cycles expected over the next 48 hours will provide the next key data points for traders.