Recent National Weather Service guidance highlights a strengthening marine layer and persistent onshore flow moderating coastal Southern California temperatures ahead of August 11, limiting daytime heating despite seasonal warmth. Model consensus from NOAA points to highs near downtown Los Angeles constrained between the mid-70s and upper 70s, with subtle differences in inversion strength and boundary-layer mixing determining whether the peak falls in the 76-77°F or 78-79°F bin. These closely matched outcomes reflect genuine forecast uncertainty around exact cloud cover timing and wind speeds rather than any single dominant driver, consistent with climatological norms for early August under neutral ENSO conditions. Updated model runs and afternoon observations will clarify resolution thresholds before market close.