The weather observed at SAN FRANCISCO, CA (KSFO) at 05:56 AM PST was: The skies were mostly clear. Temperature: 57F ( 14C) Dewpoint: 37F ( 3C) Relative Humidity: 47% Winds from the N (010 degs) at 14 mph. Pressure: 1020.3 millibars. Altimeter:30.13 inches of mercury. The prevailing visibility was 10 miles.