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

34°F

1°C

Humidity 59%
Wind Speed SE 7 mph
Barometer 30.30 in (1028.0 mb)
Dewpoint 21°F (-6°C)
Visibility 10.00 mi
Wind Chill28°F (-2°C)
Last update 19 Mar 1:56 am EDT
Extended Forecast for

Olney MD

  • Overnight

    Overnight: Mostly cloudy, with a low around 30. South wind 3 to 5 mph.

    Low: 30 °F

    Mostly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 54. South wind around 6 mph.

    High: 54 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 37. Calm wind.

    Low: 37 °F

    Mostly Cloudy

  • Friday

    Friday: A slight chance of showers after 2pm. Increasing clouds, with a high near 64. Light and variable wind becoming south 5 to 10 mph in the afternoon. Winds could gust as high as 18 mph. Chance of precipitation is 20%.

    High: 64 °F

    Mostly Sunny
    then Slight
    Chance
    Showers

  • Friday Night

    Friday Night: Showers likely, mainly between 8pm and 2am. Mostly cloudy, with a low around 49. South wind 6 to 8 mph. Chance of precipitation is 60%.

    Low: 49 °F

    Showers
    Likely

  • Saturday

    Saturday: A chance of showers before 8am. Mostly sunny, with a high near 67. Chance of precipitation is 30%.

    High: 67 °F

    Chance
    Showers then
    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 46.

    Low: 46 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 71.

    High: 71 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: A chance of rain. Mostly cloudy, with a low around 44. Chance of precipitation is 40%.

    Low: 44 °F

    Chance Rain

Detailed Forecast

Overnight
Mostly cloudy, with a low around 30. South wind 3 to 5 mph.
Thursday
Partly sunny, with a high near 54. South wind around 6 mph.
Thursday Night
Mostly cloudy, with a low around 37. Calm wind.
Friday
A slight chance of showers after 2pm. Increasing clouds, with a high near 64. Light and variable wind becoming south 5 to 10 mph in the afternoon. Winds could gust as high as 18 mph. Chance of precipitation is 20%.
Friday Night
Showers likely, mainly between 8pm and 2am. Mostly cloudy, with a low around 49. South wind 6 to 8 mph. Chance of precipitation is 60%.
Saturday
A chance of showers before 8am. Mostly sunny, with a high near 67. Chance of precipitation is 30%.
Saturday Night
Partly cloudy, with a low around 46.
Sunday
Mostly sunny, with a high near 71.
Sunday Night
A chance of rain. Mostly cloudy, with a low around 44. Chance of precipitation is 40%.
Monday
Partly sunny, with a high near 53.
Monday Night
Partly cloudy, with a low around 30.
Tuesday
Partly sunny, with a high near 47.
Tuesday Night
Mostly cloudy, with a low around 34.
Wednesday
Partly sunny, with a high near 56.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Olney MD
 39.16°N 77.06°W (Elev. 486 ft)
Last Update:
2:23 am EDT Mar 19, 2026
Forecast Valid:
2am EDT Mar 19, 2026-6pm EDT Mar 25, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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