Trader consensus prices a 32% implied probability for San Francisco's highest temperature on March 28 reaching 74°F or higher, propelled by recent GFS model runs depicting a potent upper-level ridge that could thin the persistent marine layer, enabling rapid diurnal heating under clear skies to push afternoon highs into the mid-70s. Closely matched 66-69°F outcomes (43.5% combined) stem from ECMWF ensembles forecasting stronger onshore flow and stubborn coastal stratus, aligning with March climatology where mean highs average 63°F and fog suppresses peaks by 5-10°F. Differentiating factor: model divergence on ridge strength and clearing timing, per NOAA verification data, with 12z updates pivotal amid high forecast uncertainty.