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

29°F

-2°C

Humidity 72%
Wind Speed W 5 mph
Barometer 30.42 in (1032.2 mb)
Dewpoint 21°F (-6°C)
Visibility 10.00 mi
Wind Chill24°F (-4°C)
Last update 24 Mar 7:56 am EDT
Extended Forecast for

Olney MD

  • Today

    Today: Sunny, with a high near 49. North wind around 6 mph becoming calm in the afternoon.

    High: 49 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 36. Light south wind.

    Low: 36 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Partly sunny, with a high near 57. South wind 5 to 9 mph.

    High: 57 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 47. Southeast wind around 7 mph.

    Low: 47 °F

    Mostly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 71. Southwest wind 7 to 11 mph, with gusts as high as 20 mph.

    High: 71 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: A chance of rain, then rain likely and possibly a thunderstorm after 2am. Mostly cloudy, with a low around 53. Chance of precipitation is 60%.

    Low: 53 °F

    Chance Rain
    then Rain
    Likely

  • Friday

    Friday: Rain likely, mainly before 2pm. Mostly cloudy, with a high near 61. Chance of precipitation is 60%.

    High: 61 °F

    Rain Likely

  • Friday Night

    Friday Night: A chance of rain before 8pm. Mostly cloudy, with a low around 29. Chance of precipitation is 30%.

    Low: 29 °F

    Chance Rain
    then Partly
    Cloudy

  • Saturday

    Saturday: Sunny, with a high near 48.

    High: 48 °F

    Sunny

Detailed Forecast

Today
Sunny, with a high near 49. North wind around 6 mph becoming calm in the afternoon.
Tonight
Increasing clouds, with a low around 36. Light south wind.
Wednesday
Partly sunny, with a high near 57. South wind 5 to 9 mph.
Wednesday Night
Mostly cloudy, with a low around 47. Southeast wind around 7 mph.
Thursday
Partly sunny, with a high near 71. Southwest wind 7 to 11 mph, with gusts as high as 20 mph.
Thursday Night
A chance of rain, then rain likely and possibly a thunderstorm after 2am. Mostly cloudy, with a low around 53. Chance of precipitation is 60%.
Friday
Rain likely, mainly before 2pm. Mostly cloudy, with a high near 61. Chance of precipitation is 60%.
Friday Night
A chance of rain before 8pm. Mostly cloudy, with a low around 29. Chance of precipitation is 30%.
Saturday
Sunny, with a high near 48.
Saturday Night
Mostly clear, with a low around 31.
Sunday
Sunny, with a high near 56.
Sunday Night
Mostly cloudy, with a low around 40.
Monday
Mostly sunny, with a high near 64.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Olney MD
 39.14°N 77.07°W (Elev. 499 ft)
Last Update:
7:53 am EDT Mar 24, 2026
Forecast Valid:
8am EDT Mar 24, 2026-6pm EDT Mar 30, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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