National Weather Service forecasts indicate a persistent marine layer with onshore flow and cool sea-surface temperatures will continue suppressing daytime highs in Los Angeles on May 17, consistent with the classic May Gray pattern. This stable inversion limits solar heating and vertical mixing, favoring a peak temperature in the upper 60s at official reporting stations such as KLAX. Ensemble guidance shows tight clustering around 67–70°F, with limited upside potential unless faster afternoon clearing develops. Trader consensus places the strongest probability on 68–69°F, reflecting these stable conditions and historical climatology for mid-May under similar synoptic setups, though modest warming could occur if boundary-layer mixing strengthens beyond current projections.