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

2°C

35°F

Humidity 54%
Wind Speed Calm
Barometer 1020.1 mb (30.07 in)
Dewpoint -7°C (20°F)
Visibility 16 km
Last update 17 Nov 7:56 pm EST
Extended Forecast for

Potomac MD

  • Tonight

    Tonight: Mostly clear, with a low around -1. West wind 10 to 14 km/h.

    Low: -1 °C

    Mostly Clear

  • Tuesday

    Tuesday: A chance of rain, mainly after 4pm. Increasing clouds, with a high near 9. West wind 3 to 8 km/h. Chance of precipitation is 30%.

    High: 9 °C

    Partly Sunny
    then Chance
    Rain

  • Tuesday Night

    Tuesday Night: Rain. Low around 4. Calm wind. Chance of precipitation is 90%. New precipitation amounts between 7.5 mm and 1 cm possible.

    Low: 4 °C

    Rain

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 11. Calm wind becoming north 5 to 10 km/h in the morning.

    High: 11 °C

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: Cloudy, with a low around 6. Calm wind.

    Low: 6 °C

    Cloudy

  • Thursday

    Thursday: Cloudy, with a high near 13.

    High: 13 °C

    Cloudy

  • Thursday Night

    Thursday Night: A chance of rain after 1am. Cloudy, with a low around 8. Chance of precipitation is 30%.

    Low: 8 °C

    Cloudy then
    Chance Rain

  • Friday

    Friday: A chance of rain. Mostly cloudy, with a high near 17. Chance of precipitation is 30%.

    High: 17 °C

    Chance Rain

  • Friday Night

    Friday Night: Rain likely, mainly after 1am. Mostly cloudy, with a low around 9. Chance of precipitation is 60%.

    Low: 9 °C

    Rain Likely

Detailed Forecast

Tonight
Mostly clear, with a low around -1. West wind 10 to 14 km/h.
Tuesday
A chance of rain, mainly after 4pm. Increasing clouds, with a high near 9. West wind 3 to 8 km/h. Chance of precipitation is 30%.
Tuesday Night
Rain. Low around 4. Calm wind. Chance of precipitation is 90%. New precipitation amounts between 7.5 mm and 1 cm possible.
Wednesday
Mostly cloudy, with a high near 11. Calm wind becoming north 5 to 10 km/h in the morning.
Wednesday Night
Cloudy, with a low around 6. Calm wind.
Thursday
Cloudy, with a high near 13.
Thursday Night
A chance of rain after 1am. Cloudy, with a low around 8. Chance of precipitation is 30%.
Friday
A chance of rain. Mostly cloudy, with a high near 17. Chance of precipitation is 30%.
Friday Night
Rain likely, mainly after 1am. Mostly cloudy, with a low around 9. Chance of precipitation is 60%.
Saturday
A chance of rain. Partly sunny, with a high near 13. Chance of precipitation is 40%.
Saturday Night
Partly cloudy, with a low around 3.
Sunday
Mostly sunny, with a high near 13.
Sunday Night
Partly cloudy, with a low around 3.
Monday
Mostly sunny, with a high near 14.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Potomac MD
 39.02°N 77.2°W (Elev. 381 m)
Last Update:
6:53 pm EST Nov 17, 2025
Forecast Valid:
8pm EST Nov 17, 2025-6pm EST Nov 24, 2025
 
Forecast Discussion
 
Get as KML Get as XML

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