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

Gaithersburg - Montgomery County Airport (KGAI)

Lat: 39.17°NLon: 77.17°WElev: 495ft.

A Few Clouds

75°F

24°C

Humidity 96%
Wind Speed Calm
Barometer 29.91 in (1013.6 mb)
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Last update 18 Jul 6:56 am EDT
Extended Forecast for

Washington Grove MD

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 92. Heat index values as high as 100. West wind 3 to 7 mph.  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: 92 °F

  • Tonight

    Tonight: Scattered showers and thunderstorms, mainly before 8pm.  Partly cloudy, with a low around 74. West wind 3 to 5 mph.  Chance of precipitation is 30%.

    Scattered
    Showers then
    Mostly Clear

    Low: 74 °F

  • Friday

    Friday: Sunny and hot, with a high near 98. Heat index values as high as 106. West wind 3 to 6 mph.

    Hot

    High: 98 °F

  • Friday
    Night

    Friday Night: Partly cloudy, with a low around 77. Southwest wind around 5 mph becoming calm  after midnight.

    Partly Cloudy

    Low: 77 °F

  • Saturday

    Saturday: Sunny and hot, with a high near 99. West wind 3 to 6 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 92. Heat index values as high as 100. West wind 3 to 7 mph. 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 and thunderstorms, mainly before 8pm. Partly cloudy, with a low around 74. West wind 3 to 5 mph. Chance of precipitation is 30%.
Friday
Sunny and hot, with a high near 98. Heat index values as high as 106. West wind 3 to 6 mph.
Friday Night
Partly cloudy, with a low around 77. Southwest wind around 5 mph becoming calm after midnight.
Saturday
Sunny and hot, with a high near 99. West wind 3 to 6 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 68. 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 84.
Click Map For Forecast
Point Forecast:
Washington Grove MD
 39.15°N 77.18°W (Elev. 456 ft)
6:43 am EDT Jul 18, 2019
7am EDT Jul 18, 2019-6pm EDT Jul 24, 2019
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database