Current forecast models from the National Weather Service and major ensembles project a daytime high in Austin around 100–101°F for August 15, establishing the primary driver behind the 58.5% market-implied probability for that bin. Mid-August climatology features peak solar insolation and typical dew points near 70°F, which amplify heat through reduced evaporative cooling, while urban heat-island effects in central Texas often add 2–4°F above rural baselines. Ensemble spread remains modest, with limited upside risk for 102°F+ tied to slower mixing or slightly stronger subsidence. Updated model runs and the next NWS forecast discussion will provide the key data points likely to influence trader adjustments before the market resolves.