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

64°F

18°C

Humidity 100%
Wind Speed Calm
Barometer 30.07 in (1019.3 mb)
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 21 Aug 12:56 am EDT
Extended Forecast for

Olney MD

  • Overnight

    Overnight: Mostly cloudy, with a low around 63. North wind around 6 mph.

    Low: 63 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 80. Northeast wind 3 to 7 mph.

    High: 80 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Showers likely and possibly a thunderstorm, mainly after 2am. Increasing clouds, with a low around 67. Light east wind. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 67 °F

    Mostly Cloudy
    then Showers
    Likely

  • Saturday

    Saturday: Showers likely and possibly a thunderstorm. Cloudy, with a high near 80. East wind 3 to 5 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 80 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 65. Calm wind. Chance of precipitation is 40%.

    Low: 65 °F

    Chance
    T-storms then
    Chance
    Showers

  • Sunday

    Sunday: A slight chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 81. Chance of precipitation is 20%.

    High: 81 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 61.

    Low: 61 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 79.

    High: 79 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 60.

    Low: 60 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly cloudy, with a low around 63. North wind around 6 mph.
Friday
Mostly sunny, with a high near 80. Northeast wind 3 to 7 mph.
Friday Night
Showers likely and possibly a thunderstorm, mainly after 2am. Increasing clouds, with a low around 67. Light east wind. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday
Showers likely and possibly a thunderstorm. Cloudy, with a high near 80. East wind 3 to 5 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday Night
A chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 65. Calm wind. Chance of precipitation is 40%.
Sunday
A slight chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 81. Chance of precipitation is 20%.
Sunday Night
Mostly clear, with a low around 61.
Monday
Sunny, with a high near 79.
Monday Night
Mostly clear, with a low around 60.
Tuesday
Sunny, with a high near 80.
Tuesday Night
Partly cloudy, with a low around 63.
Wednesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 84. Chance of precipitation is 40%.
Wednesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 67. Chance of precipitation is 40%.
Thursday
A chance of showers and thunderstorms. Partly sunny, with a high near 84. Chance of precipitation is 50%.
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 77.09°W (Elev. 449 ft)
Last Update:
10:53 pm EDT Aug 20, 2026
Forecast Valid:
1am EDT Aug 21, 2026-6pm EDT Aug 27, 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