Trader sentiment on San Francisco's March 28 peak temperature tilts toward 74°F or higher at 28.5% implied probability, driven by the latest NOAA GFS and ECMWF ensemble forecasts showing high-pressure ridging over California weakening the persistent marine layer for potential offshore flow and enhanced solar heating. Closely trailing bands at 68-69°F (23.5%) and 66-67°F (21.5%) hinge on boundary layer dynamics: stronger diurnal mixing could push highs into the low 70s, while stubborn coastal fog caps them mid-60s, as seen in NWS short-term outlooks. Historical late-March norms average 62-65°F at SFO, but current jet stream retreat amplifies warm anomalies, with model spread reflecting uncertainty in low-level wind shear through resolution time.