The weather observed at WASHINGTON DC, VA (KDCA) at 08:52 PM EDT was: The skies were mostly cloudy. Temperature: 79F ( 26C) Dewpoint: 59F ( 15C) Relative Humidity: 51% Winds from the SSW(200 degs) at 15 mph. Pressure: 1014.5 millibars. Altimeter:29.96 inches of mercury. The prevailing visibility was 10 miles.