National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Excessive Rainfall and Tropical Storm in the South; Severe Thunderstorms in the Midwest

Excessive rainfall may produce considerable, potentially life-threatening, flooding across the lower Mississippi River Valley and central Great Lakes region through tonight. Tropical Storm Arthur will move northeastward along the Texas coast today and then move inland over southwestern Louisiana by tonight. An outbreak of severe thunderstorms is expected across portions of Illinois and Indiana. Read More >

Current conditions at

Gaithersburg - Montgomery County Airport (KGAI)

Lat: 39.17°NLon: 77.17°WElev: 495ft.

Overcast

83°F

28°C

Humidity 43%
Wind Speed S 8 mph
Barometer 29.78 in (1009.5 mb)
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Heat Index83°F (28°C)
Last update 17 Jun 2:56 pm EDT
Extended Forecast for

Clarksburg MD

  • This Afternoon

    This Afternoon: Scattered sprinkles. Mostly sunny, with a high near 85. Southwest wind around 10 mph, with gusts as high as 21 mph.

    High: 85 °F

    Scattered
    Sprinkles

  • Tonight

    Tonight: Mostly cloudy, with a low around 70. South wind 5 to 9 mph, with gusts as high as 21 mph.

    Low: 70 °F

    Mostly Cloudy

  • Thursday

    Thursday: A chance of showers, with thunderstorms also possible after 2pm. Partly sunny, with a high near 91. Breezy, with a south wind 13 to 20 mph, with gusts as high as 33 mph. Chance of precipitation is 40%.

    High: 91 °F

    Slight Chance
    Showers then
    Chance
    T-storms and
    Breezy

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 66. West wind 5 to 11 mph, with gusts as high as 22 mph.

    Low: 66 °F

    Mostly Cloudy

  • Juneteenth

    Juneteenth: Mostly sunny, with a high near 82. Northwest wind 7 to 11 mph, with gusts as high as 21 mph.

    High: 82 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 61.

    Low: 61 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 82.

    High: 82 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 61.

    Low: 61 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 84.

    High: 84 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Scattered sprinkles. Mostly sunny, with a high near 85. Southwest wind around 10 mph, with gusts as high as 21 mph.
Tonight
Mostly cloudy, with a low around 70. South wind 5 to 9 mph, with gusts as high as 21 mph.
Thursday
A chance of showers, with thunderstorms also possible after 2pm. Partly sunny, with a high near 91. Breezy, with a south wind 13 to 20 mph, with gusts as high as 33 mph. Chance of precipitation is 40%.
Thursday Night
Mostly cloudy, with a low around 66. West wind 5 to 11 mph, with gusts as high as 22 mph.
Juneteenth
Mostly sunny, with a high near 82. Northwest wind 7 to 11 mph, with gusts as high as 21 mph.
Friday Night
Mostly clear, with a low around 61.
Saturday
Sunny, with a high near 82.
Saturday Night
Mostly clear, with a low around 61.
Sunday
Mostly sunny, with a high near 84.
Sunday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 64. Chance of precipitation is 50%.
Monday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 83. Chance of precipitation is 70%.
Monday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 62. Chance of precipitation is 30%.
Tuesday
Sunny, with a high near 81.
Tuesday Night
Mostly clear, with a low around 61.
Wednesday
Mostly sunny, with a high near 82.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Clarksburg MD
 39.22°N 77.25°W (Elev. 505 ft)
Last Update:
2:22 pm EDT Jun 17, 2026
Forecast Valid:
3pm EDT Jun 17, 2026-6pm EDT Jun 24, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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