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

67°F

19°C

Humidity 49%
Wind Speed S 3 mph
Barometer 29.98 in (1016.1 mb)
Dewpoint 47°F (8°C)
Visibility 10.00 mi
Last update 11 Mar 12:56 am EDT
Extended Forecast for

Potomac MD

  • Overnight

    Overnight: Partly cloudy, with a low around 57. South wind around 6 mph.

    Low: 57 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A chance of showers and thunderstorms, mainly after 3pm. Mostly cloudy, with a high near 79. South wind 6 to 14 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.

    High: 79 °F

    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms, then showers after 4am. Low around 44. Southwest wind 13 to 16 mph, with gusts as high as 24 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 44 °F

    Chance
    T-storms then
    Showers

  • Thursday

    Thursday: Rain showers before 5pm, then a slight chance of rain and snow showers. High near 52. Breezy, with a northwest wind 17 to 23 mph, with gusts as high as 38 mph. Chance of precipitation is 80%. Little or no snow accumulation expected.

    High: 52 °F

    Showers and
    Breezy then
    Rain/Snow
    Likely

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 32. Northwest wind 5 to 9 mph becoming calm after midnight.

    Low: 32 °F

    Mostly Clear

  • Friday

    Friday: Partly sunny, with a high near 53. Breezy.

    High: 53 °F

    Partly Sunny
    then Partly
    Sunny and
    Breezy

  • Friday Night

    Friday Night: Partly cloudy, with a low around 40.

    Low: 40 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 56.

    High: 56 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 40.

    Low: 40 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Partly cloudy, with a low around 57. South wind around 6 mph.
Wednesday
A chance of showers and thunderstorms, mainly after 3pm. Mostly cloudy, with a high near 79. South wind 6 to 14 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.
Wednesday Night
A chance of showers and thunderstorms, then showers after 4am. Low around 44. Southwest wind 13 to 16 mph, with gusts as high as 24 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday
Rain showers before 5pm, then a slight chance of rain and snow showers. High near 52. Breezy, with a northwest wind 17 to 23 mph, with gusts as high as 38 mph. Chance of precipitation is 80%. Little or no snow accumulation expected.
Thursday Night
Mostly clear, with a low around 32. Northwest wind 5 to 9 mph becoming calm after midnight.
Friday
Partly sunny, with a high near 53. Breezy.
Friday Night
Partly cloudy, with a low around 40.
Saturday
Mostly sunny, with a high near 56.
Saturday Night
Mostly cloudy, with a low around 40.
Sunday
Mostly cloudy, with a high near 66.
Sunday Night
Showers. Low around 51. Chance of precipitation is 80%.
Monday
Showers. High near 60. Chance of precipitation is 80%.
Monday Night
A chance of rain and snow showers. Partly cloudy, with a low around 27. Chance of precipitation is 30%.
Tuesday
Mostly sunny, with a high near 37.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Potomac MD
 39.04°N 77.2°W (Elev. 397 ft)
Last Update:
10:53 pm EDT Mar 10, 2026
Forecast Valid:
1am EDT Mar 11, 2026-6pm EDT Mar 17, 2026
 
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