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

23°F

-5°C

Humidity 92%
Wind Speed Calm
Barometer 30.13 in (1022.3 mb)
Dewpoint 21°F (-6°C)
Visibility 10.00 mi
Last update 13 Jan 7:56 am EST
Extended Forecast for

Potomac MD

  • Today

    Today: Mostly sunny, with a high near 50. Calm wind becoming south 5 to 9 mph in the morning.

    High: 50 °F

    Mostly Sunny

  • Tonight

    Tonight: A slight chance of rain after 1am. Mostly cloudy, with a low around 40. Southwest wind 6 to 10 mph. Chance of precipitation is 20%.

    Low: 40 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Wednesday

    Wednesday: A chance of rain. Cloudy, with a high near 52. Southwest wind around 6 mph. Chance of precipitation is 40%.

    High: 52 °F

    Chance Rain

  • Wednesday Night

    Wednesday Night: A chance of rain before 4am, then a chance of snow. Mostly cloudy, with a low around 24. Light and variable wind becoming northwest 12 to 17 mph in the evening. Winds could gust as high as 30 mph. Chance of precipitation is 50%.

    Low: 24 °F

    Chance Rain
    then Chance
    Rain/Snow

  • Thursday

    Thursday: A chance of snow before 7am. Partly sunny, with a high near 30. Northwest wind around 17 mph, with gusts as high as 30 mph. Chance of precipitation is 30%.

    High: 30 °F

    Chance Snow
    then Mostly
    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 17.

    Low: 17 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 34.

    High: 34 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 27.

    Low: 27 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 43.

    High: 43 °F

    Mostly Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 50. Calm wind becoming south 5 to 9 mph in the morning.
Tonight
A slight chance of rain after 1am. Mostly cloudy, with a low around 40. Southwest wind 6 to 10 mph. Chance of precipitation is 20%.
Wednesday
A chance of rain. Cloudy, with a high near 52. Southwest wind around 6 mph. Chance of precipitation is 40%.
Wednesday Night
A chance of rain before 4am, then a chance of snow. Mostly cloudy, with a low around 24. Light and variable wind becoming northwest 12 to 17 mph in the evening. Winds could gust as high as 30 mph. Chance of precipitation is 50%.
Thursday
A chance of snow before 7am. Partly sunny, with a high near 30. Northwest wind around 17 mph, with gusts as high as 30 mph. Chance of precipitation is 30%.
Thursday Night
Partly cloudy, with a low around 17.
Friday
Mostly sunny, with a high near 34.
Friday Night
Partly cloudy, with a low around 27.
Saturday
Mostly sunny, with a high near 43.
Saturday Night
Partly cloudy, with a low around 23.
Sunday
Partly sunny, with a high near 34.
Sunday Night
Partly cloudy, with a low around 19.
M.L.King Day
Mostly sunny, with a high near 32.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Potomac MD
 39.02°N 77.18°W (Elev. 249 ft)
Last Update:
6:53 am EST Jan 13, 2026
Forecast Valid:
8am EST Jan 13, 2026-6pm EST Jan 19, 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