Persistent marine layer and onshore flow from the Pacific are suppressing daytime heating along coastal Los Angeles, positioning the 76–77 °F and 78–79 °F bins as the closest market outcomes at 42.5 % and 36 % implied probability. National Weather Service guidance and ensemble models indicate patchy dense fog with gradual afternoon clearing, limiting the daily maximum under typical August synoptic conditions that favor upper-70s readings rather than the seasonal 82–85 °F baseline. Subtle differences in sea-breeze timing, inversion strength, and model spread on cloud cover explain the tight clustering between those two leading bins, while lower-probability outcomes above 80 °F or below 74 °F reflect the low likelihood of rapid layer erosion or unusually strong offshore flow before the daily peak. Updated forecast runs and observational data over the next 24 hours will refine these probabilities as traders incorporate the latest model consensus.