Showers and Storms continue across the East; Heat, Critical Fire Weather, Drought, and Poor Air Quality continues in the West

A series of fronts will focus locally heavy showers and storms across portions of the central and eastern U.S. through the end of the workweek. Dangerous to extreme heat continues across the Southwest U.S., eventually spreading eastward over the weekend into early next week. Elevated fire weather conditions continue across the Great Basin, with degraded air quality lingering across the Northwest. Read More >

Hazardous Weather Conditions

Current conditions at

Washington/Dulles International Airport, DC (KIAD)

Lat: 38.93°NLon: 77.45°WElev: 312ft.

Mostly Cloudy

78°F

26°C

Humidity	76%
Wind Speed	E 6 mph
Barometer	30.09 in (1018.7 mb)
Dewpoint	70°F (21°C)
Visibility	10.00 mi
Heat Index	80°F (27°C)
Last update	4 Aug 10:52 pm EDT

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

Herndon VA

Flood Watch August 5, 04:00am until August 5, 11:00am

Click here for hazard details and duration

Flood Watch

Tonight
Low: 70 °F
Showers
Likely
Wednesday
High: 85 °F
Showers
Likely and
Patchy Fog
then Chance
T-storms
Wednesday Night
Low: 72 °F
Chance
T-storms
Thursday
High: 90 °F
Sunny then
Chance
T-storms
Thursday Night
Low: 72 °F
Chance
T-storms then
Chance
Showers
Friday
High: 89 °F
Sunny then
Showers
Likely
Friday Night
Low: 71 °F
Showers
Likely then
Chance
T-storms
Saturday
High: 89 °F
Mostly Sunny
then Chance
T-storms
Saturday Night
Low: 70 °F
Chance
T-storms then
Chance
Showers

Detailed Forecast

Tonight

A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 5am. Mostly cloudy, with a low around 70. Light east wind. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Wednesday

Showers likely and possibly a thunderstorm before 11am, then a chance of showers and thunderstorms after 11am. Patchy fog before 11am. Otherwise, mostly cloudy, with a high near 85. Calm wind becoming south 5 to 7 mph in the afternoon. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Wednesday Night

A chance of thunderstorms before midnight, then a slight chance of showers and thunderstorms between midnight and 2am. Partly cloudy, with a low around 72. South wind around 6 mph. Chance of precipitation is 30%.

Thursday

A chance of showers and thunderstorms after 2pm. Increasing clouds, with a high near 90. Heat index values as high as 100. South wind 8 to 10 mph, with gusts as high as 21 mph. Chance of precipitation is 30%.

Thursday Night

A chance of showers and thunderstorms before 11pm, then a chance of showers between 11pm and 2am. Partly cloudy, with a low around 72. Southwest wind 3 to 7 mph. Chance of precipitation is 30%.

Friday

Showers likely and possibly a thunderstorm after 2pm. Mostly sunny, with a high near 89. Chance of precipitation is 60%.

Friday Night

Showers likely and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms between 8pm and 2am. Mostly cloudy, with a low around 71. Chance of precipitation is 60%.

Saturday

A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 89. Chance of precipitation is 50%.

Saturday Night

A chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 70. Chance of precipitation is 30%.

Sunday

Mostly sunny, with a high near 89.

Sunday Night

Partly cloudy, with a low around 72.

Monday

Mostly sunny, with a high near 92.

Monday Night

Partly cloudy, with a low around 73.