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

Gaithersburg - Montgomery County Airport (KGAI)

Lat: 39.17°NLon: 77.17°WElev: 495ft.

Fair

40°F

4°C

Humidity 79%
Wind Speed S 5 mph
Barometer 30.12 in (1021.3 mb)
Dewpoint 34°F (1°C)
Visibility 10.00 mi
Wind Chill36°F (2°C)
Last update 20 Mar 5:56 am EDT
Extended Forecast for

Potomac MD

  • Today

    Today: Increasing clouds, with a high near 68. Light south wind becoming southwest 9 to 14 mph in the morning. Winds could gust as high as 23 mph.

    High: 68 °F

    Increasing
    Clouds

  • Tonight

    Tonight: Showers likely, mainly before 11pm. Cloudy, then gradually becoming partly cloudy, with a low around 49. Southwest wind 6 to 10 mph becoming west after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 49 °F

    Showers
    Likely then
    Chance
    Showers

  • Saturday

    Saturday: Mostly sunny, with a high near 63. North wind around 8 mph.

    High: 63 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 46. Light and variable wind.

    Low: 46 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 76. South wind 6 to 9 mph.

    High: 76 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: A chance of rain, mainly after 2am. Mostly cloudy, with a low around 53. Chance of precipitation is 50%.

    Low: 53 °F

    Slight Chance
    Rain then
    Chance Rain

  • Monday

    Monday: A chance of rain before 2pm. Partly sunny, with a high near 60. Chance of precipitation is 30%.

    High: 60 °F

    Chance Rain

  • Monday Night

    Monday Night: Mostly clear, with a low around 32.

    Low: 32 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 51.

    High: 51 °F

    Sunny

Detailed Forecast

Today
Increasing clouds, with a high near 68. Light south wind becoming southwest 9 to 14 mph in the morning. Winds could gust as high as 23 mph.
Tonight
Showers likely, mainly before 11pm. Cloudy, then gradually becoming partly cloudy, with a low around 49. Southwest wind 6 to 10 mph becoming west after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday
Mostly sunny, with a high near 63. North wind around 8 mph.
Saturday Night
Partly cloudy, with a low around 46. Light and variable wind.
Sunday
Partly sunny, with a high near 76. South wind 6 to 9 mph.
Sunday Night
A chance of rain, mainly after 2am. Mostly cloudy, with a low around 53. Chance of precipitation is 50%.
Monday
A chance of rain before 2pm. Partly sunny, with a high near 60. Chance of precipitation is 30%.
Monday Night
Mostly clear, with a low around 32.
Tuesday
Sunny, with a high near 51.
Tuesday Night
Mostly cloudy, with a low around 38.
Wednesday
Mostly cloudy, with a high near 56.
Wednesday Night
Mostly cloudy, with a low around 41.
Thursday
Mostly sunny, with a high near 64.
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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:
4:53 am EDT Mar 20, 2026
Forecast Valid:
6am EDT Mar 20, 2026-6pm EDT Mar 26, 2026
 
Forecast Discussion
 
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Additional Resources

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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