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.

Partly Cloudy

73°F

23°C

Humidity 87%
Wind Speed S 3 mph
Barometer 29.89 in (1012.9 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Last update 26 Jul 10:56 pm EDT
Extended Forecast for

Ashton-Sandy Spring MD

  • Tonight

    Tonight: A chance of showers, mainly before midnight. Partly cloudy, with a low around 65. Calm wind. Chance of precipitation is 50%.

    Low: 65 °F

    Chance
    Showers

  • Monday

    Monday: A chance of showers and thunderstorms, mainly after 3pm. Mostly sunny, with a high near 85. Light south wind. Chance of precipitation is 30%.

    High: 85 °F

    Mostly Sunny
    then Chance
    T-storms

  • Monday Night

    Monday Night: A slight chance of showers and thunderstorms before 10pm. Increasing clouds, with a low around 68. Light south wind. Chance of precipitation is 20%.

    Low: 68 °F

    Slight Chance
    T-storms then
    Mostly Cloudy

  • Tuesday

    Tuesday: Showers and possibly a thunderstorm. High near 81. South wind 5 to 9 mph, with gusts as high as 20 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 81 °F

    Showers
    Likely then
    Showers

  • Tuesday Night

    Tuesday Night: Showers and thunderstorms before 11pm, then a chance of showers between 11pm and 2am. Low around 65. Northwest wind 5 to 7 mph. Chance of precipitation is 80%.

    Low: 65 °F

    Showers then
    Chance
    Showers

  • Wednesday

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

    High: 81 °F

    Partly Sunny
    then Chance
    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 65. Chance of precipitation is 30%.

    Low: 65 °F

    Chance
    Showers then
    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 82.

    High: 82 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 65.

    Low: 65 °F

    Partly Cloudy

Detailed Forecast

Tonight
A chance of showers, mainly before midnight. Partly cloudy, with a low around 65. Calm wind. Chance of precipitation is 50%.
Monday
A chance of showers and thunderstorms, mainly after 3pm. Mostly sunny, with a high near 85. Light south wind. Chance of precipitation is 30%.
Monday Night
A slight chance of showers and thunderstorms before 10pm. Increasing clouds, with a low around 68. Light south wind. Chance of precipitation is 20%.
Tuesday
Showers and possibly a thunderstorm. High near 81. South wind 5 to 9 mph, with gusts as high as 20 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Tuesday Night
Showers and thunderstorms before 11pm, then a chance of showers between 11pm and 2am. Low around 65. Northwest wind 5 to 7 mph. Chance of precipitation is 80%.
Wednesday
A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 81. Chance of precipitation is 40%.
Wednesday Night
A chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 65. Chance of precipitation is 30%.
Thursday
Mostly sunny, with a high near 82.
Thursday Night
Partly cloudy, with a low around 65.
Friday
Sunny, with a high near 85.
Friday Night
Partly cloudy, with a low around 68.
Saturday
A slight chance of showers and thunderstorms. Partly sunny, with a high near 86. Chance of precipitation is 20%.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 68. Chance of precipitation is 30%.
Sunday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 83. Chance of precipitation is 60%.
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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:
10:53 pm EDT Jul 26, 2026
Forecast Valid:
11pm EDT Jul 26, 2026-6pm EDT Aug 2, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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