The weather observed at LAS VEGAS, NV (KLAS) at 03:56 PM PDT was: The skies were partly cloudy. Temperature: 57F ( 14C) Dewpoint: 39F ( 4C) Relative Humidity: 51% Winds from the SW (220 degs) at 15 mph. Pressure: 1003.1 millibars. Altimeter:29.65 inches of mercury. The prevailing visibility was 10 miles.