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

40°F

4°C

Humidity 93%
Wind Speed Calm
Barometer 30.03 in (1018.6 mb)
Dewpoint 38°F (3°C)
Visibility 10.00 mi
Last update 7 Jan 9:56 pm EST
Extended Forecast for

Ashton-Sandy Spring MD

  • Tonight

    Tonight: Patchy fog after 5am. Otherwise, mostly clear, with a low around 33. Light northwest wind.

    Low: 33 °F

    Mostly Clear
    then Patchy
    Fog

  • Thursday

    Thursday: Patchy fog before 9am. Otherwise, mostly sunny, with a high near 51. Light and variable wind.

    High: 51 °F

    Patchy Fog
    then Mostly
    Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 39. Calm wind becoming south around 5 mph after midnight.

    Low: 39 °F

    Mostly Cloudy

  • Friday

    Friday: A chance of rain after 1pm. Cloudy, with a high near 57. South wind 6 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 40%.

    High: 57 °F

    Mostly Cloudy
    then Chance
    Rain

  • Friday Night

    Friday Night: Rain likely, mainly after 1am. Cloudy, with a low around 52. Southwest wind 5 to 7 mph. Chance of precipitation is 70%.

    Low: 52 °F

    Rain Likely

  • Saturday

    Saturday: Rain. High near 62. Chance of precipitation is 100%.

    High: 62 °F

    Rain

  • Saturday Night

    Saturday Night: Rain likely, mainly before 1am. Cloudy, with a low around 42. Chance of precipitation is 70%.

    Low: 42 °F

    Rain Likely

  • Sunday

    Sunday: Mostly cloudy, with a high near 49.

    High: 49 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 27.

    Low: 27 °F

    Partly Cloudy

Detailed Forecast

Tonight
Patchy fog after 5am. Otherwise, mostly clear, with a low around 33. Light northwest wind.
Thursday
Patchy fog before 9am. Otherwise, mostly sunny, with a high near 51. Light and variable wind.
Thursday Night
Mostly cloudy, with a low around 39. Calm wind becoming south around 5 mph after midnight.
Friday
A chance of rain after 1pm. Cloudy, with a high near 57. South wind 6 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 40%.
Friday Night
Rain likely, mainly after 1am. Cloudy, with a low around 52. Southwest wind 5 to 7 mph. Chance of precipitation is 70%.
Saturday
Rain. High near 62. Chance of precipitation is 100%.
Saturday Night
Rain likely, mainly before 1am. Cloudy, with a low around 42. Chance of precipitation is 70%.
Sunday
Mostly cloudy, with a high near 49.
Sunday Night
Partly cloudy, with a low around 27.
Monday
Sunny, with a high near 40.
Monday Night
Partly cloudy, with a low around 27.
Tuesday
Mostly sunny, with a high near 45.
Tuesday Night
Partly cloudy, with a low around 30.
Wednesday
Mostly cloudy, with a high near 45.
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ABOUT THIS FORECAST

 
Point Forecast:
Ashton-Sandy Spring MD
 39.15°N 77.01°W (Elev. 449 ft)
Last Update:
9:53 pm EST Jan 7, 2026
Forecast Valid:
10pm EST Jan 7, 2026-6pm EST Jan 14, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation