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.

A Few Clouds

45°F

7°C

Humidity 74%
Wind Speed E 3 mph
Barometer 30.43 in (1031.6 mb)
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Last update 12 Apr 4:56 am EDT
Extended Forecast for

Olney MD

  • Today

    Today: Mostly sunny, with a high near 72. East wind 7 to 13 mph becoming south in the afternoon. Winds could gust as high as 22 mph.

    High: 72 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 55. South wind 10 to 13 mph, with gusts as high as 22 mph.

    Low: 55 °F

    Mostly Cloudy

  • Monday

    Monday: A slight chance of showers after 2pm. Partly sunny, with a high near 86. Breezy, with a southwest wind 13 to 20 mph, with gusts as high as 33 mph. Chance of precipitation is 20%.

    High: 86 °F

    Partly Sunny
    then Slight
    Chance
    Showers and
    Breezy

  • Monday Night

    Monday Night: Partly cloudy, with a low around 61. West wind 5 to 9 mph.

    Low: 61 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A slight chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 89. Southwest wind 7 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 20%.

    High: 89 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A slight chance of showers and thunderstorms before 8pm, then a slight chance of showers between 8pm and 2am. Partly cloudy, with a low around 64. Chance of precipitation is 20%.

    Low: 64 °F

    Slight Chance
    T-storms then
    Slight Chance
    Showers

  • Wednesday

    Wednesday: Mostly sunny, with a high near 90.

    High: 90 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 67.

    Low: 67 °F

    Mostly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 90.

    High: 90 °F

    Partly Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 72. East wind 7 to 13 mph becoming south in the afternoon. Winds could gust as high as 22 mph.
Tonight
Mostly cloudy, with a low around 55. South wind 10 to 13 mph, with gusts as high as 22 mph.
Monday
A slight chance of showers after 2pm. Partly sunny, with a high near 86. Breezy, with a southwest wind 13 to 20 mph, with gusts as high as 33 mph. Chance of precipitation is 20%.
Monday Night
Partly cloudy, with a low around 61. West wind 5 to 9 mph.
Tuesday
A slight chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 89. Southwest wind 7 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 20%.
Tuesday Night
A slight chance of showers and thunderstorms before 8pm, then a slight chance of showers between 8pm and 2am. Partly cloudy, with a low around 64. Chance of precipitation is 20%.
Wednesday
Mostly sunny, with a high near 90.
Wednesday Night
Mostly cloudy, with a low around 67.
Thursday
Partly sunny, with a high near 90.
Thursday Night
Mostly cloudy, with a low around 67.
Friday
Mostly sunny, with a high near 84.
Friday Night
Partly cloudy, with a low around 62.
Saturday
Mostly sunny, with a high near 88.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Olney MD
 39.16°N 77.06°W (Elev. 486 ft)
Last Update:
4:53 am EDT Apr 12, 2026
Forecast Valid:
5am EDT Apr 12, 2026-6pm EDT Apr 18, 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