The weather observed at WASHINGTON DC, VA (KDCA) at 03:52 AM EDT was: The skies were cloudy. Temperature: 77F ( 25C) Dewpoint: 73F ( 23C) Relative Humidity: 89% Winds from the SSW(200 degs) at 6 mph. Pressure: 1016.6 millibars. Altimeter:30.02 inches of mercury. The prevailing visibility was 10 miles.