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

48°F

9°C

Humidity 36%
Wind Speed W 10 mph
Barometer 29.86 in (1012.6 mb)
Dewpoint 22°F (-6°C)
Visibility 10.00 mi
Wind Chill44°F (7°C)
Last update 14 Mar 3:56 am EDT
Extended Forecast for

Olney MD

  • Today

    Today: Sunny, with a high near 54. West wind 11 to 15 mph, with gusts as high as 26 mph.

    High: 54 °F

    Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 38. Calm wind becoming east around 5 mph after midnight.

    Low: 38 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 57. Southeast wind 8 to 15 mph, with gusts as high as 25 mph.

    High: 57 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Showers. Low around 51. Southeast wind around 14 mph, with gusts as high as 24 mph. Chance of precipitation is 100%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 51 °F

    Showers
    Likely then
    Showers

  • Monday

    Monday: Showers, with thunderstorms also possible after 2pm. High near 69. Breezy, with a south wind 14 to 21 mph, with gusts as high as 33 mph. Chance of precipitation is 100%.

    High: 69 °F

    Showers and
    Breezy

  • Monday Night

    Monday Night: Rain showers likely, mixing with snow after 11pm, then gradually ending. Some thunder is also possible. Mostly cloudy, with a low around 28. Chance of precipitation is 70%. Little or no snow accumulation expected.

    Low: 28 °F

    Rain/Snow
    Likely

  • Tuesday

    Tuesday: Mostly sunny, with a high near 35.

    High: 35 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 22.

    Low: 22 °F

    Mostly Clear

  • Wednesday

    Wednesday: Partly sunny, with a high near 41.

    High: 41 °F

    Partly Sunny

Detailed Forecast

Today
Sunny, with a high near 54. West wind 11 to 15 mph, with gusts as high as 26 mph.
Tonight
Mostly cloudy, with a low around 38. Calm wind becoming east around 5 mph after midnight.
Sunday
Mostly cloudy, with a high near 57. Southeast wind 8 to 15 mph, with gusts as high as 25 mph.
Sunday Night
Showers. Low around 51. Southeast wind around 14 mph, with gusts as high as 24 mph. Chance of precipitation is 100%. New precipitation amounts between a tenth and quarter of an inch possible.
Monday
Showers, with thunderstorms also possible after 2pm. High near 69. Breezy, with a south wind 14 to 21 mph, with gusts as high as 33 mph. Chance of precipitation is 100%.
Monday Night
Rain showers likely, mixing with snow after 11pm, then gradually ending. Some thunder is also possible. Mostly cloudy, with a low around 28. Chance of precipitation is 70%. Little or no snow accumulation expected.
Tuesday
Mostly sunny, with a high near 35.
Tuesday Night
Mostly clear, with a low around 22.
Wednesday
Partly sunny, with a high near 41.
Wednesday Night
Partly cloudy, with a low around 30.
Thursday
Mostly sunny, with a high near 51.
Thursday Night
Partly cloudy, with a low around 36.
Friday
Mostly sunny, with a high near 58.
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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:
1:53 am EDT Mar 14, 2026
Forecast Valid:
4am EDT Mar 14, 2026-6pm EDT Mar 20, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation