Recent easing of a prolonged heat dome over Southern California, driven by an eastward-shifting upper-level high and increasing onshore southwest flow, is the primary driver keeping trader-implied odds tightly clustered around 66–71°F for the August 31 overnight low at LAX. National Weather Service guidance points to a gradual marine-layer redevelopment that promotes stratus and fog, limiting radiational cooling while moderate winds reduce surface decoupling. Model consensus shows modest spread tied to marine-layer depth and sea-breeze timing—shallower layers or stronger mixing favor mid- to upper-60s readings, while clearer skies or weaker flow could allow brief dips toward 64°F or hold lows near 70°F. Historical August climatology centers near 65°F, and current conditions lack signals for extremes below 62°F or above 72°F, sustaining the market’s balanced distribution ahead of final overnight observations.