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Tropical Storm Arthur and Heavy Rainfall in the South; Severe Weather in the Midwest

An outbreak of severe thunderstorms is expected across portions of Illinois and Indiana tonight. Intense tornadoes, swaths of damaging gusts, and hail in excess of 2 inches in diameter possible. Tropical Storm Arthur will continue to produce strong winds across coastal Upper Texas and Louisiana tonight, as well as potentially life-threatening flooding across southern Louisiana into Mississippi. Read More >

Hazardous Weather Conditions

Current conditions at

Gaithersburg - Montgomery County Airport (KGAI)

Lat: 39.17°NLon: 77.17°WElev: 495ft.

A Few Clouds

74°F

23°C

Humidity 69%
Wind Speed SW 6 mph
Barometer 29.71 in (1006.9 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 18 Jun 6:56 am EDT
Extended Forecast for

Gaithersburg MD

  • Today

    Today: A slight chance of showers, then a chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 92. Breezy, with a west wind 13 to 21 mph, with gusts as high as 34 mph. Chance of precipitation is 30%.

    High: 92 °F

    Breezy.
    Slight Chance
    Showers then
    Chance
    T-storms

  • Tonight

    Tonight: A slight chance of showers between 2am and 5am, then a chance of showers and thunderstorms after 5am. Increasing clouds, with a low around 68. West wind 5 to 10 mph becoming light after midnight. Winds could gust as high as 21 mph. Chance of precipitation is 30%.

    Low: 68 °F

    Partly Cloudy
    then Chance
    Showers

  • Juneteenth

    Juneteenth: A chance of showers and thunderstorms before 8am, then a slight chance of showers between 8am and 10am. Cloudy through mid morning, then gradual clearing, with a high near 83. Northwest wind 5 to 10 mph, with gusts as high as 21 mph. Chance of precipitation is 30%.

    High: 83 °F

    Chance
    Showers then
    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 62. West wind 5 to 9 mph, with gusts as high as 20 mph.

    Low: 62 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 84. Northwest wind 7 to 13 mph, with gusts as high as 24 mph.

    High: 84 °F

    Sunny

  • Saturday Night

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

    Low: 62 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 86.

    High: 86 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms, mainly after 2am. Mostly cloudy, with a low around 69. Chance of precipitation is 40%.

    Low: 69 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Monday

    Monday: Showers likely, then showers and possibly a thunderstorm after 2pm. High near 84. Chance of precipitation is 80%.

    High: 84 °F

    Showers

Detailed Forecast

Today
A slight chance of showers, then a chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 92. Breezy, with a west wind 13 to 21 mph, with gusts as high as 34 mph. Chance of precipitation is 30%.
Tonight
A slight chance of showers between 2am and 5am, then a chance of showers and thunderstorms after 5am. Increasing clouds, with a low around 68. West wind 5 to 10 mph becoming light after midnight. Winds could gust as high as 21 mph. Chance of precipitation is 30%.
Juneteenth
A chance of showers and thunderstorms before 8am, then a slight chance of showers between 8am and 10am. Cloudy through mid morning, then gradual clearing, with a high near 83. Northwest wind 5 to 10 mph, with gusts as high as 21 mph. Chance of precipitation is 30%.
Friday Night
Mostly clear, with a low around 62. West wind 5 to 9 mph, with gusts as high as 20 mph.
Saturday
Sunny, with a high near 84. Northwest wind 7 to 13 mph, with gusts as high as 24 mph.
Saturday Night
Mostly clear, with a low around 62.
Sunday
Mostly sunny, with a high near 86.
Sunday Night
A chance of showers and thunderstorms, mainly after 2am. Mostly cloudy, with a low around 69. Chance of precipitation is 40%.
Monday
Showers likely, then showers and possibly a thunderstorm after 2pm. High near 84. Chance of precipitation is 80%.
Monday Night
Showers and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms between 8pm and 2am. Low around 62. Chance of precipitation is 80%.
Tuesday
Mostly sunny, with a high near 82.
Tuesday Night
Mostly clear, with a low around 61.
Wednesday
Mostly sunny, with a high near 84.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Gaithersburg MD
 39.13°N 77.21°W (Elev. 404 ft)
Last Update:
4:53 am EDT Jun 18, 2026
Forecast Valid:
7am EDT Jun 18, 2026-6pm EDT Jun 24, 2026
 
Forecast Discussion
 
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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

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation