Recent National Weather Service model guidance and ensemble runs point to a highest temperature near 71°F at Los Angeles International Airport on May 18, reflecting persistent moderate onshore flow from the cool Pacific and a shallow marine layer that restricts afternoon warming. This setup keeps coastal stratus lingering into midday before partial clearing, producing highs tightly clustered in the low 70s. Historical May climatology shows average highs around 74°F, yet onshore winds and low-level moisture commonly suppress peaks by several degrees. Key differentiating variables include the precise timing of marine-layer dissipation, afternoon wind speeds near 10 mph, and any subtle strengthening of the Pacific subtropical high. Updated short-range forecasts expected over the next 24 hours will refine these thresholds ahead of market resolution.