The weather observed at SAN FRANCISCO, CA (KSFO) at 03:56 PM PDT was: The skies were mostly clear. Temperature: 66F ( 19C) Dewpoint: 54F ( 12C) Relative Humidity: 64% Winds from the NW (310 degs) at 17 mph. Pressure: 1010.5 millibars. Altimeter:29.84 inches of mercury. The prevailing visibility was 10 miles.