Traders assign the highest implied probability (53.5%) to a peak of 100-101°F in Austin on August 13 because National Weather Service and private model guidance consistently project afternoon highs in that narrow range under persistent high pressure and southerly flow. Clear to partly cloudy skies, light winds, and dew points in the mid-70s support efficient daytime heating without significant cloud cover or precipitation to moderate temperatures. Seasonal climatology places normal August maxima near 97-99°F, so current guidance reflects a modest warm anomaly consistent with the broader Central Texas heat dome. Nearby model runs showing 98-99°F or 102-103°F account for the secondary probabilities (23.5% and 14%), while outcomes outside 96-103°F remain low-probability tails given the limited spread in the latest forecast suite. Updated National Weather Service briefings and morning model cycles on August 12 will provide the final inputs before resolution.