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

51°F

11°C

Humidity 31%
Wind Speed S 12 mph
Barometer 29.93 in (1015.2 mb)
Dewpoint 21°F (-6°C)
Visibility 10.00 mi
Wind Chill47°F (8°C)
Last update 13 Jan 1:56 pm EST
Extended Forecast for

Olney MD

  • This Afternoon

    This Afternoon: Partly sunny, with a high near 50. South wind around 10 mph, with gusts as high as 20 mph.

    High: 50 °F

    Partly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 40. Southwest wind 7 to 11 mph, with gusts as high as 22 mph.

    Low: 40 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A chance of rain before noon, then a chance of rain after 3pm. Cloudy, with a high near 51. Southwest wind around 6 mph. Chance of precipitation is 30%.

    High: 51 °F

    Chance Rain

  • Wednesday Night

    Wednesday Night: Rain likely before 10pm, then rain and snow likely between 10pm and 4am, then a slight chance of snow after 4am. Mostly cloudy, with a low around 22. Light and variable wind becoming northwest 5 to 10 mph in the evening. Winds could gust as high as 20 mph. Chance of precipitation is 70%. Little or no snow accumulation expected.

    Low: 22 °F

    Rain/Snow
    Likely

  • Thursday

    Thursday: Mostly sunny, with a high near 29. Northwest wind 14 to 17 mph, with gusts as high as 26 mph.

    High: 29 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 16.

    Low: 16 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 33.

    High: 33 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 27.

    Low: 27 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 42.

    High: 42 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Partly sunny, with a high near 50. South wind around 10 mph, with gusts as high as 20 mph.
Tonight
Mostly cloudy, with a low around 40. Southwest wind 7 to 11 mph, with gusts as high as 22 mph.
Wednesday
A chance of rain before noon, then a chance of rain after 3pm. Cloudy, with a high near 51. Southwest wind around 6 mph. Chance of precipitation is 30%.
Wednesday Night
Rain likely before 10pm, then rain and snow likely between 10pm and 4am, then a slight chance of snow after 4am. Mostly cloudy, with a low around 22. Light and variable wind becoming northwest 5 to 10 mph in the evening. Winds could gust as high as 20 mph. Chance of precipitation is 70%. Little or no snow accumulation expected.
Thursday
Mostly sunny, with a high near 29. Northwest wind 14 to 17 mph, with gusts as high as 26 mph.
Thursday Night
Mostly clear, with a low around 16.
Friday
Mostly sunny, with a high near 33.
Friday Night
Partly cloudy, with a low around 27.
Saturday
Mostly sunny, with a high near 42.
Saturday Night
Mostly cloudy, with a low around 21.
Sunday
Partly sunny, with a high near 29.
Sunday Night
Partly cloudy, with a low around 16.
M.L.King Day
Mostly sunny, with a high near 32.
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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:
12:54 pm EST Jan 13, 2026
Forecast Valid:
2pm EST Jan 13, 2026-6pm EST Jan 19, 2026
 
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Additional Resources

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National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation