Trader sentiment for San Francisco's highest temperature on March 28 centers on NOAA's short-range forecasts indicating a peak near 68-72°F under a strengthening subtropical high-pressure ridge, elevating 74°F or higher odds to 28.5% despite competition from 66-73°F bins at 19.5-21.5%. Differentiating factors include marine layer persistence—persistent westerly sea breezes and coastal stratus typically cap highs at 64-67°F, as seen in 70% of recent March days, while northerly winds or ridge-induced subsidence could clear skies for 72°F+ outliers, akin to 2023's warm anomaly. Ensemble models show 2-4°F spread, with afternoon mixing depth key; monitor 12z GFS/ECMWF updates for shifts before resolution.