National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Heavy Great Lakes Snow through Friday; Extreme Cold and Potential for Major Winter Storm Late Week into this Weekend

Multiple clipper systems will bring cold temperatures and enhance lake-effect snow downwind of the Great Lakes. An arctic blast will bring frigid temperatures accompanied with gusty winds that may lead to dangerous wind chills beginning in the Northern Plains Thursday before expanding to the South and East. An expansive winter storm will start Friday in the Southern Rockies/Plains and Mid-South. Read More >

Current conditions at

Gaithersburg - Montgomery County Airport (KGAI)

Lat: 39.17°NLon: 77.17°WElev: 495ft.

Fair

13°F

-11°C

Humidity 64%
Wind Speed Calm
Barometer 30.50 in (1035.2 mb)
Dewpoint 3°F (-16°C)
Visibility 10.00 mi
Last update 20 Jan 10:56 pm EST
Extended Forecast for

Olney MD

  • Tonight

    Tonight: Clear, with a low around 13. Light and variable wind.

    Low: 13 °F

    Clear

  • Wednesday

    Wednesday: Increasing clouds, with a high near 38. Light southeast wind becoming south 9 to 14 mph in the morning. Winds could gust as high as 25 mph.

    High: 38 °F

    Increasing
    Clouds

  • Wednesday Night

    Wednesday Night: Cloudy during the early evening, then gradual clearing, with a low around 30. South wind 8 to 10 mph, with gusts as high as 21 mph.

    Low: 30 °F

    Gradual
    Clearing

  • Thursday

    Thursday: Mostly sunny, with a high near 47. Southwest wind 6 to 11 mph, with gusts as high as 22 mph.

    High: 47 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 25. Northwest wind 3 to 6 mph.

    Low: 25 °F

    Partly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 36.

    High: 36 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 9.

    Low: 9 °F

    Mostly Cloudy

  • Saturday

    Saturday: A chance of snow after 1pm. Mostly cloudy, with a high near 17. Chance of precipitation is 40%.

    High: 17 °F

    Mostly Cloudy
    then Chance
    Snow

  • Saturday Night

    Saturday Night: Snow. Low around 12. Chance of precipitation is 80%.

    Low: 12 °F

    Snow

Detailed Forecast

Tonight
Clear, with a low around 13. Light and variable wind.
Wednesday
Increasing clouds, with a high near 38. Light southeast wind becoming south 9 to 14 mph in the morning. Winds could gust as high as 25 mph.
Wednesday Night
Cloudy during the early evening, then gradual clearing, with a low around 30. South wind 8 to 10 mph, with gusts as high as 21 mph.
Thursday
Mostly sunny, with a high near 47. Southwest wind 6 to 11 mph, with gusts as high as 22 mph.
Thursday Night
Partly cloudy, with a low around 25. Northwest wind 3 to 6 mph.
Friday
Partly sunny, with a high near 36.
Friday Night
Mostly cloudy, with a low around 9.
Saturday
A chance of snow after 1pm. Mostly cloudy, with a high near 17. Chance of precipitation is 40%.
Saturday Night
Snow. Low around 12. Chance of precipitation is 80%.
Sunday
Snow. High near 19. Chance of precipitation is 80%.
Sunday Night
A chance of snow. Mostly cloudy, with a low around 8. Chance of precipitation is 40%.
Monday
Mostly sunny, with a high near 22.
Monday Night
Partly cloudy, with a low around 7.
Tuesday
Mostly sunny, with a high near 25.
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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:
9:53 pm EST Jan 20, 2026
Forecast Valid:
11pm EST Jan 20, 2026-6pm EST Jan 27, 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