Recent National Weather Service guidance and ensemble model runs show persistent subtropical ridging over Texas through midweek, supporting daytime highs near or above 100°F and overnight lows typically in the upper 70s, yet with notable spread in minimum temperature solutions for August 25. This uncertainty—driven by variable low-level moisture, possible weak frontal boundary timing, and differences between GFS and ECMWF outputs—explains why traders assign 35% implied probability to 69°F or below while clustering roughly 26% each around the 72–77°F range. Historical August climatology places Austin’s average low near 75°F, so any deviation hinges on whether steering patterns allow brief radiational cooling or increased cloud cover; next NWS forecast discussions and updated model cycles will likely sharpen resolution ahead of the overnight period.