Surface observations

Data from the National Weather Service, made available here by the UAlbany Department of Earth and Atmospheric Sciences

The weather observed at SAN FRANCISCO, CA (KSFO) at 02:56 AM PST was:
  The skies were partly cloudy.
  Temperature: 57F ( 14C)  Dewpoint:  53F ( 12C)  Relative Humidity:  87%
  Winds from the SW (240 degs) at  5 mph.
  Pressure: 1008.2 millibars.  Altimeter:29.77 inches of mercury.
  The prevailing visibility was 10 miles.