Latest National Weather Service forecasts for Austin show overnight lows in the mid- to upper-70s on September 30, driven by persistent southerly flow off the Gulf, increasing cloud cover, and scattered showers that limit radiational cooling. Model consensus points to a minimum near 76–78°F, with uncertainty arising from variable precipitation timing and potential for clearer breaks that could allow slightly lower readings or warmer conditions if mixing persists. This scientific setup explains the closely matched market-implied odds between sub-70°F and 88°F+ outcomes, as traders weigh the narrow range of plausible minima against historical late-September baselines around 70°F. Updated model runs and NWS briefings over the next 48 hours will likely tighten the distribution ahead of resolution.