Dangerous Heat and Humidity Building from the Plains to the East Coast

A strengthening ridge of high pressure will produce much above average temperatures from the Plains to the East Coast, a true summer heat wave. Highs in the 90s and triple digits combined w/ humidity and dewpoints surging into the upper 70s, if not low 80s, will create heat indices as high as 110 to 115 through this weekend. Air quality will likely be poor due to haze and little air circulation. Read More >

Current conditions at

Washington/Dulles International Airport, DC (KIAD)

Lat: 38.93°NLon: 77.45°WElev: 312ft.

Mostly Cloudy

77°F

25°C

Humidity 90%
Wind Speed Calm
Barometer 29.89 in (1011.9 mb)
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 18 Jul 6:52 am EDT
Extended Forecast for

5 Miles NNW Haymarket VA

Excessive Heat Watch July 19, 10:00am until July 21, 10:00pm
Click here for hazard details and duration
Excessive Heat Watch
  • Today

    Today: A slight chance of showers before 11am, then showers likely and possibly a thunderstorm between 11am and 5pm, then scattered showers and thunderstorms after 5pm. Some of the storms could produce heavy rain.  Mostly cloudy, with a high near 90. Calm wind becoming west around 6 mph in the morning.  Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Heavy Rain

    High: 90 °F

  • Tonight

    Tonight: Scattered showers before 8pm.  Partly cloudy, with a low around 74. Light west wind.  Chance of precipitation is 30%.

    Scattered
    Showers then
    Mostly Clear

    Low: 74 °F

  • Friday

    Friday: Sunny and hot, with a high near 97. Heat index values as high as 105. West wind 3 to 5 mph.

    Hot

    High: 97 °F

  • Friday
    Night

    Friday Night: Partly cloudy, with a low around 77. Southwest wind 3 to 5 mph.

    Partly Cloudy

    Low: 77 °F

  • Saturday

    Saturday: Sunny and hot, with a high near 99. West wind 3 to 5 mph.

    Hot

    High: 99 °F

  • Saturday
    Night

    Saturday Night: Partly cloudy, with a low around 78.

    Partly Cloudy

    Low: 78 °F

  • Sunday

    Sunday: A chance of showers and thunderstorms.  Mostly sunny, with a high near 96. Chance of precipitation is 40%.

    Chance
    T-storms

    High: 96 °F

  • Sunday
    Night

    Sunday Night: A chance of showers and thunderstorms.  Mostly cloudy, with a low around 77. Chance of precipitation is 50%.

    Chance
    T-storms

    Low: 77 °F

  • Monday

    Monday: Showers and thunderstorms likely.  Mostly cloudy, with a high near 89. Chance of precipitation is 70%.

    T-storms
    Likely

    High: 89 °F

Detailed Forecast

Today
A slight chance of showers before 11am, then showers likely and possibly a thunderstorm between 11am and 5pm, then scattered showers and thunderstorms after 5pm. Some of the storms could produce heavy rain. Mostly cloudy, with a high near 90. Calm wind becoming west around 6 mph in the morning. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tonight
Scattered showers before 8pm. Partly cloudy, with a low around 74. Light west wind. Chance of precipitation is 30%.
Friday
Sunny and hot, with a high near 97. Heat index values as high as 105. West wind 3 to 5 mph.
Friday Night
Partly cloudy, with a low around 77. Southwest wind 3 to 5 mph.
Saturday
Sunny and hot, with a high near 99. West wind 3 to 5 mph.
Saturday Night
Partly cloudy, with a low around 78.
Sunday
A chance of showers and thunderstorms. Mostly sunny, with a high near 96. Chance of precipitation is 40%.
Sunday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 77. Chance of precipitation is 50%.
Monday
Showers and thunderstorms likely. Mostly cloudy, with a high near 89. Chance of precipitation is 70%.
Monday Night
A chance of showers. Mostly cloudy, with a low around 70. Chance of precipitation is 40%.
Tuesday
A chance of showers. Partly sunny, with a high near 84. Chance of precipitation is 40%.
Tuesday Night
Partly cloudy, with a low around 66.
Wednesday
Mostly sunny, with a high near 83.
Click Map For Forecast
Point Forecast:
5 Miles NNW Haymarket VA
 38.89°N 77.66°W (Elev. 407 ft)
6:43 am EDT Jul 18, 2019
7am EDT Jul 18, 2019-6pm EDT Jul 24, 2019
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database