The weather observed at LAS VEGAS, NV (KLAS) at 04:56 PM PST was: The skies were mostly cloudy. Temperature: 70F ( 21C) Dewpoint: 25F ( -4C) Relative Humidity: 18% Winds from the SW (210 degs) at 14 mph. Pressure: 1006.9 millibars. Altimeter:29.78 inches of mercury. The prevailing visibility was 10 miles.