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

83°F

28°C

Humidity 40%
Wind Speed SE 3 mph
Barometer 29.91 in (1013.9 mb)
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 15 Apr 7:56 pm EDT
Extended Forecast for

Potomac MD

  • Tonight

    Tonight: Partly cloudy, with a low around 69. Southwest wind 3 to 7 mph.

    Low: 69 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 91. Calm wind becoming southwest 5 to 8 mph in the afternoon.

    High: 91 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A chance of showers. Mostly cloudy, with a low around 68. Southwest wind 6 to 8 mph becoming west after midnight. Chance of precipitation is 30%.

    Low: 68 °F

    Chance
    Showers

  • Friday

    Friday: A chance of showers. Partly sunny, with a high near 82. Northwest wind 6 to 8 mph. Chance of precipitation is 30%.

    High: 82 °F

    Chance
    Showers

  • Friday Night

    Friday Night: Partly cloudy, with a low around 61. North wind around 5 mph becoming calm in the evening.

    Low: 61 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 85.

    High: 85 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A chance of showers. Mostly cloudy, with a low around 53. Chance of precipitation is 50%.

    Low: 53 °F

    Chance
    Showers

  • Sunday

    Sunday: Showers likely, mainly before 2pm. Mostly cloudy, with a high near 65. Chance of precipitation is 60%.

    High: 65 °F

    Showers
    Likely

  • Sunday Night

    Sunday Night: A chance of showers before 8pm. Partly cloudy, with a low around 40. Chance of precipitation is 30%.

    Low: 40 °F

    Chance
    Showers then
    Partly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 69. Southwest wind 3 to 7 mph.
Thursday
Mostly sunny, with a high near 91. Calm wind becoming southwest 5 to 8 mph in the afternoon.
Thursday Night
A chance of showers. Mostly cloudy, with a low around 68. Southwest wind 6 to 8 mph becoming west after midnight. Chance of precipitation is 30%.
Friday
A chance of showers. Partly sunny, with a high near 82. Northwest wind 6 to 8 mph. Chance of precipitation is 30%.
Friday Night
Partly cloudy, with a low around 61. North wind around 5 mph becoming calm in the evening.
Saturday
Mostly sunny, with a high near 85.
Saturday Night
A chance of showers. Mostly cloudy, with a low around 53. Chance of precipitation is 50%.
Sunday
Showers likely, mainly before 2pm. Mostly cloudy, with a high near 65. Chance of precipitation is 60%.
Sunday Night
A chance of showers before 8pm. Partly cloudy, with a low around 40. Chance of precipitation is 30%.
Monday
Sunny, with a high near 56.
Monday Night
Mostly clear, with a low around 37.
Tuesday
Sunny, with a high near 68.
Tuesday Night
Mostly clear, with a low around 53.
Wednesday
Mostly sunny, with a high near 76.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Potomac MD
 39.02°N 77.2°W (Elev. 381 ft)
Last Update:
7:53 pm EDT Apr 15, 2026
Forecast Valid:
8pm EDT Apr 15, 2026-6pm EDT Apr 22, 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