Summer Heat Continues; Severe Weather For Northeast

A large ridge of high pressure continues to bring summer heat and humidity to several sections of the country. Excessive heat warnings and heat advisories are in effect across the Desert Southwest, southern Plains, Lower Mississippi Valley and a small part of the Mid-Atlantic. Meanwhile, severe thunderstorms are forecast for the Northeast and northern Mid-Atlantic today. Read More >

Hazardous Weather Conditions

Current conditions at

Gaithersburg - Montgomery County Airport (KGAI)

Lat: 39.17°NLon: 77.17°WElev: 495ft.

Mostly Cloudy

74°F

23°C

Humidity 88%
Wind Speed SW 5 mph
Barometer 30.01 in (1017.1 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Last update 21 Aug 8:56 am EDT
Extended Forecast for

Derwood MD

  • Today

    Today: Isolated showers, then scattered showers and thunderstorms after 11am.  Partly sunny, with a high near 91. Southwest wind 7 to 11 mph.  Chance of precipitation is 40%.

    Scattered
    T-storms

    High: 91 °F

  • Tonight

    Tonight: Scattered showers and thunderstorms, mainly before 11pm.  Mostly cloudy, then gradually becoming mostly clear, with a low around 72. West wind 5 to 7 mph.  Chance of precipitation is 40%.

    Scattered
    T-storms

    Low: 72 °F

  • Thursday

    Thursday: A chance of showers and thunderstorms after 8am.  Mostly sunny, with a high near 90. West wind 5 to 8 mph.  Chance of precipitation is 50%.

    Chance
    Showers then
    Chance
    T-storms

    High: 90 °F

  • Thursday
    Night

    Thursday Night: A chance of showers and thunderstorms.  Mostly cloudy, with a low around 67. West wind 3 to 6 mph.  Chance of precipitation is 50%.

    Chance
    T-storms then
    Chance
    Showers

    Low: 67 °F

  • Friday

    Friday: A chance of showers, with thunderstorms also possible after 8am.  Mostly cloudy, with a high near 80. North wind 5 to 7 mph.  Chance of precipitation is 50%.

    Chance
    Showers then
    Chance
    T-storms

    High: 80 °F

  • Friday
    Night

    Friday Night: A chance of showers and thunderstorms, mainly before 2am.  Mostly cloudy, with a low around 62. Chance of precipitation is 40%.

    Chance
    T-storms then
    Chance
    Showers

    Low: 62 °F

  • Saturday

    Saturday: Mostly sunny, with a high near 80.

    Mostly Sunny

    High: 80 °F

  • Saturday
    Night

    Saturday Night: Mostly clear, with a low around 62.

    Mostly Clear

    Low: 62 °F

  • Sunday

    Sunday: Mostly sunny, with a high near 81.

    Mostly Sunny

    High: 81 °F

Detailed Forecast

Today
Isolated showers, then scattered showers and thunderstorms after 11am. Partly sunny, with a high near 91. Southwest wind 7 to 11 mph. Chance of precipitation is 40%.
Tonight
Scattered showers and thunderstorms, mainly before 11pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 72. West wind 5 to 7 mph. Chance of precipitation is 40%.
Thursday
A chance of showers and thunderstorms after 8am. Mostly sunny, with a high near 90. West wind 5 to 8 mph. Chance of precipitation is 50%.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 67. West wind 3 to 6 mph. Chance of precipitation is 50%.
Friday
A chance of showers, with thunderstorms also possible after 8am. Mostly cloudy, with a high near 80. North wind 5 to 7 mph. Chance of precipitation is 50%.
Friday Night
A chance of showers and thunderstorms, mainly before 2am. Mostly cloudy, with a low around 62. Chance of precipitation is 40%.
Saturday
Mostly sunny, with a high near 80.
Saturday Night
Mostly clear, with a low around 62.
Sunday
Mostly sunny, with a high near 81.
Sunday Night
Partly cloudy, with a low around 64.
Monday
A chance of showers. Partly sunny, with a high near 79. Chance of precipitation is 30%.
Monday Night
A chance of showers. Mostly cloudy, with a low around 66. Chance of precipitation is 30%.
Tuesday
A chance of showers and thunderstorms. Partly sunny, with a high near 83. Chance of precipitation is 40%.
Click Map For Forecast
Point Forecast:
Derwood MD
 39.12°N 77.13°W (Elev. 348 ft)
7:31 am EDT Aug 21, 2019
9am EDT Aug 21, 2019-6pm EDT Aug 27, 2019
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database