Marine layer persistence and onshore flow from the Pacific are the dominant factors shaping trader positioning around the 66–71°F brackets for downtown Los Angeles on June 6. National Weather Service guidance and ensemble models indicate a shallow marine layer with morning stratus and a strengthening sea breeze that typically caps daytime maxima near the coast, preventing stronger warming despite an emerging El Niño pattern favoring above-average regional temperatures. Recent days have shown similar suppression, with observed highs near 74–76°F giving way to cooler readings when the layer lingers. Traders are weighing the timing of any afternoon clearing against historical June climatology, where coastal stations average 72–75°F but frequently fall short under persistent onshore regimes. Updated NWS point forecasts and model runs over the next 24 hours will likely refine the exact peak.