The weather observed at SAN FRANCISCO, CA (KSFO) at 11:56 AM PST was: The skies were mostly cloudy. Temperature: 54F ( 12C) Dewpoint: 39F ( 4C) Relative Humidity: 58% Winds from the WNW(290 degs) at 23 mph. Pressure: 1013.9 millibars. Altimeter:29.94 inches of mercury. The prevailing visibility was 10 miles.