**A cold front approaching Austin overnight is the main driver behind the 47% market-implied probability for a low of 61°F or below on October 15.** National Weather Service and other models show southeast winds shifting northerly after midnight, with gusts to 40 mph and a 30% chance of showers, accelerating cooling. Forecast overnight lows cluster in the low-to-mid 60s or cooler, consistent with the mid-October climatological average near 58°F and recent model runs favoring the lower bins. Higher-temperature outcomes (mid-60s to mid-70s) hold secondary support around 34% each amid lingering warm air ahead of the front, while extremes above 78°F remain negligible at 0.1%. Updated model guidance and official minimum temperature observations will determine final resolution.