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 with Haze

63°F

17°C

Humidity NA
Wind Speed Calm
Barometer 29.96 in (1015.4 mb)
Dewpoint N/A
Visibility 6.00 mi
Last update 19 Aug 4:56 am EDT
Extended Forecast for

Gaithersburg MD

  • Today

    Today: Patchy fog before 8am. Otherwise, sunny, with a high near 87. Calm wind becoming west around 5 mph in the afternoon.

    High: 87 °F

    Patchy Fog
    then Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 70. Calm wind.

    Low: 70 °F

    Partly Cloudy

  • Thursday

    Thursday: A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Increasing clouds, with a high near 82. Calm wind becoming southwest around 5 mph in the afternoon. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 82 °F

    Chance
    Showers then
    Showers
    Likely

  • Thursday Night

    Thursday Night: Showers and thunderstorms likely before 8pm, then a slight chance of showers between 8pm and 2am. Mostly cloudy, with a low around 64. Light north wind. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 64 °F

    Showers
    Likely then
    Slight Chance
    Showers

  • Friday

    Friday: A slight chance of showers between 2pm and 5pm, then a slight chance of showers and thunderstorms after 5pm. Mostly sunny, with a high near 82. North wind around 5 mph becoming east in the afternoon. Chance of precipitation is 20%.

    High: 82 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Friday Night

    Friday Night: A chance of showers and thunderstorms, mainly after 8pm. Mostly cloudy, with a low around 66. Chance of precipitation is 50%.

    Low: 66 °F

    Chance
    T-storms then
    Chance
    Showers

  • Saturday

    Saturday: A chance of showers. Partly sunny, with a high near 82. Chance of precipitation is 50%.

    High: 82 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 66. Chance of precipitation is 40%.

    Low: 66 °F

    Chance
    Showers

  • Sunday

    Sunday: A slight chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 84. Chance of precipitation is 20%.

    High: 84 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

Detailed Forecast

Today
Patchy fog before 8am. Otherwise, sunny, with a high near 87. Calm wind becoming west around 5 mph in the afternoon.
Tonight
Partly cloudy, with a low around 70. Calm wind.
Thursday
A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Increasing clouds, with a high near 82. Calm wind becoming southwest around 5 mph in the afternoon. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday Night
Showers and thunderstorms likely before 8pm, then a slight chance of showers between 8pm and 2am. Mostly cloudy, with a low around 64. Light north wind. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday
A slight chance of showers between 2pm and 5pm, then a slight chance of showers and thunderstorms after 5pm. Mostly sunny, with a high near 82. North wind around 5 mph becoming east in the afternoon. Chance of precipitation is 20%.
Friday Night
A chance of showers and thunderstorms, mainly after 8pm. Mostly cloudy, with a low around 66. Chance of precipitation is 50%.
Saturday
A chance of showers. Partly sunny, with a high near 82. Chance of precipitation is 50%.
Saturday Night
A chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 66. Chance of precipitation is 40%.
Sunday
A slight chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 84. Chance of precipitation is 20%.
Sunday Night
Partly cloudy, with a low around 64.
Monday
Sunny, with a high near 82.
Monday Night
Mostly clear, with a low around 63.
Tuesday
Sunny, with a high near 83.
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ABOUT THIS FORECAST

 
Point Forecast:
Gaithersburg MD
 39.16°N 77.24°W (Elev. 400 ft)
Last Update:
4:52 am EDT Aug 19, 2026
Forecast Valid:
5am EDT Aug 19, 2026-6pm EDT Aug 25, 2026
 
Forecast Discussion
 
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Additional Resources

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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