Areas of Severe Thunderstorms and Excessive Rainfall; Heat Wave Builds in the Intermountain West and Plains

A slow moving front will bring rounds of strong to severe thunderstorms and heavy rainfall to the central Plains eastward to the east-central U.S.. The first widespread significant heat wave of summer for the Intermountain West and Plains is expected to develop today and expand through next week. Dangerous heat will continue to impact portions of the Southwest and Southeast. Read More >

Current conditions at

Washington/Dulles International Airport, DC (KIAD)

Lat: 38.93°NLon: 77.45°WElev: 312ft.

Mostly Cloudy

81°F

27°C

Humidity	67%
Wind Speed	NW 5 mph
Barometer	29.92 in (1012.8 mb)
Dewpoint	69°F (21°C)
Visibility	10.00 mi
Heat Index	84°F (29°C)
Last update	10 Jul 8:52 am EDT

More Information:

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

Extended Forecast for

Herndon VA

Today
High: 89 °F
Mostly Sunny
then Chance
T-storms
Tonight
Low: 70 °F
Chance
T-storms then
Mostly Cloudy
Saturday
High: 84 °F
Partly Sunny
then Showers
Likely
Saturday Night
Low: 66 °F
Chance
T-storms then
Chance
Showers
Sunday
High: 84 °F
Partly Sunny
Sunday Night
Low: 65 °F
Partly Cloudy
Monday
High: 85 °F
Mostly Sunny
Monday Night
Low: 65 °F
Mostly Clear
Tuesday
High: 90 °F
Sunny

Detailed Forecast

Today

A chance of showers and thunderstorms, mainly after 3pm. Increasing clouds, with a high near 89. Southwest wind around 7 mph. Chance of precipitation is 40%.

Tonight

A chance of showers and thunderstorms, mainly before 7pm. Increasing clouds, with a low around 70. Calm wind. Chance of precipitation is 30%.

Saturday

Showers likely and possibly a thunderstorm between 2pm and 3pm, then a slight chance of showers and thunderstorms after 3pm. Partly sunny, with a high near 84. Northwest wind 5 to 7 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Saturday Night

A chance of showers and thunderstorms before 11pm, then a chance of showers between 11pm and 2am. Mostly cloudy, with a low around 66. Northeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 30%.

Sunday

Partly sunny, with a high near 84. East wind around 6 mph.

Sunday Night

Partly cloudy, with a low around 65.

Monday

Mostly sunny, with a high near 85.

Monday Night

Mostly clear, with a low around 65.

Tuesday

Sunny, with a high near 90.

Tuesday Night

Mostly clear, with a low around 69.