Persistent high pressure and southerly flow across central Texas have maintained elevated dew points near 70°F, limiting nocturnal radiational cooling and supporting overnight lows in the upper 70s for Austin on August 23. National Weather Service and private model consensus (including recent GFS and ECMWF runs) indicates a minimum near 79–80°F under mostly clear skies and light south winds, well above the late-August climatological average of ~73°F. The 71°F-or-below outcome reflects residual trader weighting of possible model shifts or localized urban cooling pockets, while the 90°F-or-higher bin captures the low-probability tail of extreme heat retention; the clustered 74–81°F bins align with the narrow forecast envelope and modest spread among guidance. No frontal passage or increased cloud cover is expected before resolution, keeping the primary uncertainty centered on exact dew-point advection and boundary-layer mixing overnight.