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.

Overcast

77°F

25°C

Humidity 100%
Wind Speed Calm
Barometer 30.18 in (1022.9 mb)
Dewpoint 77°F (25°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 16 Aug 10:56 am EDT
Extended Forecast for

Lisbon MD

  • Today

    Today: Isolated showers before noon. Partly sunny, with a high near 86. Light southeast wind. Chance of precipitation is 20%.

    High: 86 °F

    Isolated
    Showers

  • Tonight

    Tonight: Mostly clear, with a low around 69. Calm wind.

    Low: 69 °F

    Mostly Clear

  • Sunday

    Sunday: A slight chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 90. Light south wind. Chance of precipitation is 20%.

    High: 90 °F

    Sunny then
    Slight Chance
    T-storms

  • Sunday Night

    Sunday Night: A slight chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 2am. Partly cloudy, with a low around 70. Calm wind becoming north around 5 mph after midnight. Chance of precipitation is 20%.

    Low: 70 °F

    Slight Chance
    T-storms then
    Slight Chance
    Showers

  • Monday

    Monday: A slight chance of showers after 2pm. Mostly sunny, with a high near 81. Northeast wind around 6 mph. Chance of precipitation is 20%.

    High: 81 °F

    Mostly Sunny
    then Slight
    Chance
    Showers

  • Monday Night

    Monday Night: A slight chance of showers. Mostly cloudy, with a low around 66. Chance of precipitation is 20%.

    Low: 66 °F

    Slight Chance
    Showers

  • Tuesday

    Tuesday: A chance of showers after 2pm. Partly sunny, with a high near 79. Chance of precipitation is 30%.

    High: 79 °F

    Mostly Cloudy
    then Chance
    Showers

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 65. Chance of precipitation is 30%.

    Low: 65 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: A chance of showers after 2pm. Partly sunny, with a high near 81. Chance of precipitation is 40%.

    High: 81 °F

    Partly Sunny
    then Chance
    Showers

Detailed Forecast

Today
Isolated showers before noon. Partly sunny, with a high near 86. Light southeast wind. Chance of precipitation is 20%.
Tonight
Mostly clear, with a low around 69. Calm wind.
Sunday
A slight chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 90. Light south wind. Chance of precipitation is 20%.
Sunday Night
A slight chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 2am. Partly cloudy, with a low around 70. Calm wind becoming north around 5 mph after midnight. Chance of precipitation is 20%.
Monday
A slight chance of showers after 2pm. Mostly sunny, with a high near 81. Northeast wind around 6 mph. Chance of precipitation is 20%.
Monday Night
A slight chance of showers. Mostly cloudy, with a low around 66. Chance of precipitation is 20%.
Tuesday
A chance of showers after 2pm. Partly sunny, with a high near 79. Chance of precipitation is 30%.
Tuesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 65. Chance of precipitation is 30%.
Wednesday
A chance of showers after 2pm. Partly sunny, with a high near 81. Chance of precipitation is 40%.
Wednesday Night
A chance of showers before 2am. Mostly cloudy, with a low around 64. Chance of precipitation is 30%.
Thursday
Partly sunny, with a high near 78.
Thursday Night
Partly cloudy, with a low around 62.
Friday
Mostly sunny, with a high near 79.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Lisbon MD
 39.34°N 77.09°W (Elev. 699 ft)
Last Update:
10:29 am EDT Aug 16, 2025
Forecast Valid:
11am EDT Aug 16, 2025-6pm EDT Aug 22, 2025
 
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