A strong Pacific cold front advancing across central Texas on October 1–2 is the dominant driver pushing market-implied odds toward an 80–81 °F high (36.5 %). Official National Weather Service and model guidance show widespread showers and thunderstorms, with northerly winds and extensive cloud cover limiting daytime heating and keeping maximum temperatures well below the late-September/early-October climatological average of 86–87 °F. Consensus forecasts from multiple sources cluster the October 2 high in the upper 70s to low 80s, with the heaviest rain and coolest air arriving during peak heating hours. This setup explains the combined 82 % probability on the 78–83 °F brackets and the sharp drop-off in odds for 84 °F or higher. Traders are also monitoring any last-minute shifts in frontal timing or rainfall intensity that could allow brief clearing and a modest temperature rebound before sunset.