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

Risks of Severe Thunderstorms and Excessive Rainfall; Fire Weather Concerns and Record Warmth

Severe thunderstorms and flash flooding risks increase across the center of the nation today. Meanwhile, ongoing thunderstorms and flash flooding will linger along the Gulf Coast states through the evening. The Great Basin and Intermountain West, warm temperatures and dry fuels with dry lightning may enhance fire weather potential. In addition, across interior Alaska, Red Flag Warning are posted. Read More >

Current conditions at

Gaithersburg - Montgomery County Airport (KGAI)

Lat: 39.17°NLon: 77.17°WElev: 495ft.

Fair

82°F

28°C

Humidity 34%
Wind Speed NW 10 mph
Barometer 29.87 in (1012.4 mb)
Dewpoint 51°F (11°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 20 Jun 5:56 pm EDT
Extended Forecast for

Potomac MD

  • Tonight

    Tonight: Mostly clear, with a low around 64. West wind 8 to 13 mph becoming light northwest in the evening. Winds could gust as high as 23 mph.

    Low: 64 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 86. West wind 5 to 9 mph, with gusts as high as 18 mph.

    High: 86 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 66. Light and variable wind.

    Low: 66 °F

    Mostly Cloudy

  • Monday

    Monday: A slight chance of showers, then showers and possibly a thunderstorm after 2pm. High near 90. Southeast wind 7 to 14 mph becoming southwest in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    High: 90 °F

    Slight Chance
    Showers then
    Showers

  • Monday Night

    Monday Night: Showers and possibly a thunderstorm before 11pm, then showers likely. Low around 67. South wind 3 to 6 mph. Chance of precipitation is 80%.

    Low: 67 °F

    Showers

  • Tuesday

    Tuesday: A chance of showers, mainly before 8am. Mostly sunny, with a high near 83. Chance of precipitation is 30%.

    High: 83 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 62.

    Low: 62 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 84.

    High: 84 °F

    Sunny

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms after 2am. Partly cloudy, with a low around 65. Chance of precipitation is 30%.

    Low: 65 °F

    Mostly Clear
    then Chance
    Showers

Detailed Forecast

Tonight
Mostly clear, with a low around 64. West wind 8 to 13 mph becoming light northwest in the evening. Winds could gust as high as 23 mph.
Sunday
Sunny, with a high near 86. West wind 5 to 9 mph, with gusts as high as 18 mph.
Sunday Night
Mostly cloudy, with a low around 66. Light and variable wind.
Monday
A slight chance of showers, then showers and possibly a thunderstorm after 2pm. High near 90. Southeast wind 7 to 14 mph becoming southwest in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Monday Night
Showers and possibly a thunderstorm before 11pm, then showers likely. Low around 67. South wind 3 to 6 mph. Chance of precipitation is 80%.
Tuesday
A chance of showers, mainly before 8am. Mostly sunny, with a high near 83. Chance of precipitation is 30%.
Tuesday Night
Partly cloudy, with a low around 62.
Wednesday
Sunny, with a high near 84.
Wednesday Night
A chance of showers and thunderstorms after 2am. Partly cloudy, with a low around 65. Chance of precipitation is 30%.
Thursday
A chance of showers and thunderstorms. Partly sunny, with a high near 85. Chance of precipitation is 50%.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 65. Chance of precipitation is 40%.
Friday
A chance of showers and thunderstorms. Partly sunny, with a high near 86. Chance of precipitation is 40%.
Friday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 65. Chance of precipitation is 30%.
Saturday
A chance of showers and thunderstorms. Mostly sunny, with a high near 86. Chance of precipitation is 30%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Potomac MD
 39.02°N 77.2°W (Elev. 381 ft)
Last Update:
6:02 pm EDT Jun 20, 2026
Forecast Valid:
6pm EDT Jun 20, 2026-6pm EDT Jun 27, 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