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

40°F

4°C

Humidity 79%
Wind Speed S 5 mph
Barometer 30.12 in (1021.3 mb)
Dewpoint 34°F (1°C)
Visibility 10.00 mi
Wind Chill36°F (2°C)
Last update 20 Mar 5:56 am EDT
Extended Forecast for

Olney MD

  • Today

    Today: Increasing clouds, with a high near 67. Light south wind becoming southwest 9 to 14 mph in the morning. Winds could gust as high as 23 mph.

    High: 67 °F

    Increasing
    Clouds

  • Tonight

    Tonight: Showers likely, mainly before 9pm. Cloudy during the early evening, then gradual clearing, with a low around 47. Southwest wind 6 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 47 °F

    Showers
    Likely then
    Slight Chance
    Showers

  • Saturday

    Saturday: Mostly sunny, with a high near 62. North wind around 8 mph.

    High: 62 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 45. Light and variable wind.

    Low: 45 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 74. Southwest wind 6 to 10 mph, with gusts as high as 18 mph.

    High: 74 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: A chance of rain, mainly after 2am. Mostly cloudy, with a low around 51. Chance of precipitation is 50%.

    Low: 51 °F

    Slight Chance
    Rain then
    Chance Rain

  • Monday

    Monday: A chance of rain before 2pm. Partly sunny, with a high near 58. Chance of precipitation is 40%.

    High: 58 °F

    Chance Rain

  • Monday Night

    Monday Night: Mostly clear, with a low around 31.

    Low: 31 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 50.

    High: 50 °F

    Sunny

Detailed Forecast

Today
Increasing clouds, with a high near 67. Light south wind becoming southwest 9 to 14 mph in the morning. Winds could gust as high as 23 mph.
Tonight
Showers likely, mainly before 9pm. Cloudy during the early evening, then gradual clearing, with a low around 47. Southwest wind 6 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday
Mostly sunny, with a high near 62. North wind around 8 mph.
Saturday Night
Partly cloudy, with a low around 45. Light and variable wind.
Sunday
Partly sunny, with a high near 74. Southwest wind 6 to 10 mph, with gusts as high as 18 mph.
Sunday Night
A chance of rain, mainly after 2am. Mostly cloudy, with a low around 51. Chance of precipitation is 50%.
Monday
A chance of rain before 2pm. Partly sunny, with a high near 58. Chance of precipitation is 40%.
Monday Night
Mostly clear, with a low around 31.
Tuesday
Sunny, with a high near 50.
Tuesday Night
Mostly cloudy, with a low around 36.
Wednesday
Mostly cloudy, with a high near 55.
Wednesday Night
Mostly cloudy, with a low around 39.
Thursday
Partly sunny, with a high near 63.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Olney MD
 39.16°N 77.06°W (Elev. 486 ft)
Last Update:
4:53 am EDT Mar 20, 2026
Forecast Valid:
6am EDT Mar 20, 2026-6pm EDT Mar 26, 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