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 PDT was:
  The skies were clear.
  Temperature: 52F ( 11C)  Dewpoint:  52F ( 11C)  Relative Humidity: 100%
  Winds from the WNW(290 degs) at  7 mph.
  Pressure: 1014.3 millibars.  Altimeter:29.95 inches of mercury.
  The prevailing visibility was 10 miles.