Recent National Weather Service guidance points to a persistent marine layer and steady onshore flow as the dominant drivers holding coastal Los Angeles temperatures in check for August 13, favoring a daily high near 74–77 °F. These conditions advect cooler, moister air from the Pacific, promoting low stratus and limiting afternoon heating despite seasonal norms around 84 °F. Updated model runs show the inversion remaining intact through the day, with only modest warming possible if the layer thins later than expected. Traders have concentrated probability on the 74–77 °F bins, reflecting alignment between official forecasts and historical analogs for similar late-summer marine regimes, while assigning low odds to excursions above 78 °F absent a rapid pattern shift.