Marine layer clouds and persistent onshore flow from the Pacific Ocean are the dominant factors capping coastal Los Angeles highs near the mid-70s on August 14, consistent with National Weather Service guidance and recent model consensus. This typical summertime pattern suppresses inland heat advection and maintains marine influence across the Los Angeles basin, preventing excursions into the upper 70s or low 80s despite broader regional warming trends earlier in the month. Recent observations at KLAX and downtown stations show daytime peaks stabilizing around 73–77 °F with dew points in the low 60s, aligning with climatological August averages rather than heat-wave conditions. Traders have concentrated implied probability on the 76–77 °F bin at 69.5 percent, reflecting the narrow forecast window before any late-day clearing or wind shift could nudge readings slightly higher.