The weather observed at WASHINGTON DC, VA (KDCA) at 05:52 PM EST was: The skies were mostly clear. Temperature: 72F ( 22C) Dewpoint: 63F ( 17C) Relative Humidity: 73% Winds from the S (180 degs) at 8 mph. Pressure: 1021.9 millibars. Altimeter:30.18 inches of mercury. The prevailing visibility was 10 miles.