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

35°F

2°C

Humidity 59%
Wind Speed S 12 mph
Barometer 30.33 in (1028.8 mb)
Dewpoint 22°F (-6°C)
Visibility 10.00 mi
Wind Chill27°F (-3°C)
Last update 30 Nov 3:56 am EST
Extended Forecast for

Olney MD

  • Today

    Today: Rain and snow likely before 10am, then a chance of rain between 10am and 3pm. Mostly cloudy, with a high near 44. South wind 6 to 10 mph, with gusts as high as 21 mph. Chance of precipitation is 60%. Total daytime snow accumulation of less than a half inch possible.

    High: 44 °F

    Rain/Snow
    Likely then
    Chance Rain

  • Tonight

    Tonight: Partly cloudy, with a low around 29. Northwest wind 6 to 10 mph, with gusts as high as 20 mph.

    Low: 29 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 43. North wind 5 to 10 mph, with gusts as high as 18 mph.

    High: 43 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Snow likely after 1am, mixing with rain after 4am. Increasing clouds, with a low around 29. Light and variable wind. Chance of precipitation is 60%. New snow accumulation of around an inch possible.

    Low: 29 °F

    Mostly Cloudy
    then
    Rain/Snow
    Likely

  • Tuesday

    Tuesday: Rain, possibly mixed with snow, becoming all rain after 1pm. High near 40. Light and variable wind becoming northwest 5 to 7 mph in the morning. Chance of precipitation is 90%. New snow accumulation of less than a half inch possible.

    High: 40 °F

    Rain/Snow

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 24.

    Low: 24 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 38.

    High: 38 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 26.

    Low: 26 °F

    Partly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 44.

    High: 44 °F

    Partly Sunny

Detailed Forecast

Today
Rain and snow likely before 10am, then a chance of rain between 10am and 3pm. Mostly cloudy, with a high near 44. South wind 6 to 10 mph, with gusts as high as 21 mph. Chance of precipitation is 60%. Total daytime snow accumulation of less than a half inch possible.
Tonight
Partly cloudy, with a low around 29. Northwest wind 6 to 10 mph, with gusts as high as 20 mph.
Monday
Mostly sunny, with a high near 43. North wind 5 to 10 mph, with gusts as high as 18 mph.
Monday Night
Snow likely after 1am, mixing with rain after 4am. Increasing clouds, with a low around 29. Light and variable wind. Chance of precipitation is 60%. New snow accumulation of around an inch possible.
Tuesday
Rain, possibly mixed with snow, becoming all rain after 1pm. High near 40. Light and variable wind becoming northwest 5 to 7 mph in the morning. Chance of precipitation is 90%. New snow accumulation of less than a half inch possible.
Tuesday Night
Partly cloudy, with a low around 24.
Wednesday
Sunny, with a high near 38.
Wednesday Night
Partly cloudy, with a low around 26.
Thursday
Partly sunny, with a high near 44.
Thursday Night
Partly cloudy, with a low around 18.
Friday
Mostly cloudy, with a high near 33.
Friday Night
Snow likely. Cloudy, with a low around 26. Chance of precipitation is 60%.
Saturday
A chance of rain. Mostly cloudy, with a high near 39. Chance of precipitation is 40%.
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ABOUT THIS FORECAST

 
Point Forecast:
Olney MD
 39.14°N 77.1°W (Elev. 449 ft)
Last Update:
3:53 am EST Nov 30, 2025
Forecast Valid:
4am EST Nov 30, 2025-6pm EST Dec 6, 2025
 
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Additional Resources

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Chance of Precipitation