Trader consensus on Polymarket tilts slightly toward a 62-63°F high at San Francisco International Airport (KSFO) with 33% implied probability, narrowly ahead of 60-61°F at 28.5%, driven by the latest National Weather Service guidance showing model ensembles clustering around 61°F amid persistent marine layer effects. This coastal stratus deck, fueled by cool upwelled waters from the California Current and capped by a 1,500-2,000 ft temperature inversion, typically suppresses afternoon peaks unless midday solar heating erodes it fully. Recent 00Z GFS and ECMWF runs diverged slightly after yesterday's deeper layer observations, with partial burn-off favoring upper 60s in some members while onshore westerlies at 10-15 kt sustain clouds for low 60s outcomes. Monitor this afternoon's satellite imagery and evening forecast discussion for resolution shifts before tomorrow's observations.