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

42°F

6°C

Humidity 100%
Wind Speed Calm
Barometer 29.73 in (1008.5 mb)
Dewpoint 42°F (6°C)
Visibility 8.00 mi
Last update 6 Jan 7:56 pm EST
Extended Forecast for

Ashton-Sandy Spring MD

  • Tonight

    Tonight: Patchy fog before 11pm. Otherwise, mostly cloudy, with a low around 41. Light and variable wind becoming southwest around 6 mph in the evening.

    Low: 41 °F

    Patchy Fog
    then Mostly
    Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 54. West wind 6 to 13 mph, with gusts as high as 23 mph.

    High: 54 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 34. Northwest wind around 6 mph becoming calm in the evening.

    Low: 34 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 52. Calm wind becoming south around 5 mph in the afternoon.

    High: 52 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A slight chance of rain after 1am. Mostly cloudy, with a low around 41. Southeast wind 3 to 6 mph. Chance of precipitation is 20%.

    Low: 41 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Friday

    Friday: Rain likely, mainly after 1pm. Cloudy, with a high near 60. Chance of precipitation is 60%.

    High: 60 °F

    Rain Likely

  • Friday Night

    Friday Night: Rain likely, mainly after 1am. Cloudy, with a low around 53. Chance of precipitation is 70%.

    Low: 53 °F

    Rain Likely

  • Saturday

    Saturday: Rain. High near 62. Chance of precipitation is 90%.

    High: 62 °F

    Rain

  • Saturday Night

    Saturday Night: Rain likely, mainly before 1am. Mostly cloudy, with a low around 42. Chance of precipitation is 60%.

    Low: 42 °F

    Rain Likely

Detailed Forecast

Tonight
Patchy fog before 11pm. Otherwise, mostly cloudy, with a low around 41. Light and variable wind becoming southwest around 6 mph in the evening.
Wednesday
Mostly sunny, with a high near 54. West wind 6 to 13 mph, with gusts as high as 23 mph.
Wednesday Night
Mostly clear, with a low around 34. Northwest wind around 6 mph becoming calm in the evening.
Thursday
Mostly sunny, with a high near 52. Calm wind becoming south around 5 mph in the afternoon.
Thursday Night
A slight chance of rain after 1am. Mostly cloudy, with a low around 41. Southeast wind 3 to 6 mph. Chance of precipitation is 20%.
Friday
Rain likely, mainly after 1pm. Cloudy, with a high near 60. Chance of precipitation is 60%.
Friday Night
Rain likely, mainly after 1am. Cloudy, with a low around 53. Chance of precipitation is 70%.
Saturday
Rain. High near 62. Chance of precipitation is 90%.
Saturday Night
Rain likely, mainly before 1am. Mostly cloudy, with a low around 42. Chance of precipitation is 60%.
Sunday
Partly sunny, with a high near 49.
Sunday Night
Partly cloudy, with a low around 28.
Monday
Mostly sunny, with a high near 42.
Monday Night
Partly cloudy, with a low around 29.
Tuesday
Partly sunny, with a high near 46.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Ashton-Sandy Spring MD
 39.15°N 77.01°W (Elev. 449 ft)
Last Update:
6:53 pm EST Jan 6, 2026
Forecast Valid:
8pm EST Jan 6, 2026-6pm EST Jan 13, 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