Forecasts from the National Weather Service and major models indicate an overnight low in the upper 70s for Austin on August 25 under mostly clear skies with light southerly winds and dew points near 70°F, limiting radiational cooling. Persistent high pressure and above-normal 850 mb temperatures sustain the heat, though subtle drops in mid-level warmth noted in recent soundings introduce minor uncertainty. Historical August minima average near 72°F, yet current conditions favor warmer readings unless enhanced clear-sky cooling or light winds allow greater surface heat loss. These variables explain the tight clustering of market-implied odds around 72–79°F ranges, as traders weigh forecast confidence intervals against typical late-summer variability ahead of the next model update cycle.